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# John Clarke Online

Author, Scientist, ...

## Sitemaps

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## Posts

- [Blog](https://johnclarkeonline.com/blog/)
- [Did I Discover a New Optical Phenomenon?](https://johnclarkeonline.com/2026/07/25/did-i-discover-a-new-optical-phenomenon/) - In 1966, I may have accidentally discovered a new optical effect. But for 60 years, I've been unsure. Until now. I noticed the phenomenon on my own, in my dorm room. The next day, I was sitting in a classroom with a youngish professor, probably of assistant professor rank. I liked both him, and optical
- [Saturation Diving for Marine Science](https://johnclarkeonline.com/2026/01/30/saturation-diving-for-marine-science/) - From CCR bounce dives to saturation habitats, a Navy diving scientist explains why living under pressure is the future of mesophotic coral research.
- [When Truth Breaks Down: Disinformation in the Digital Age](https://johnclarkeonline.com/2026/01/02/when-truth-breaks-down-disinformation-in-the-digital-age/) - A reflective exploration of how online disinformation and AI-driven errors distort personal identity and public trust: What the growing uncertainty reveals.
- [A New Novella from John Clarke](https://johnclarkeonline.com/2025/11/11/a-new-novella-from-john-clarke/) - Historical fiction and romance collide in an account of young people during a time when the Vietnam War and its aftermath dominate the headlines. As the heat from the 1967 Summer of Love turns to the chill of winter, a relationship both sweet and bitter is renewed. Decades after their whirlwind 1960s romance ends, strait-laced
- [Simulated Mechanical Chaos. Toy or Teaching Tool?](https://johnclarkeonline.com/2025/08/19/simulated-mechanical-chaos-toy-or-teaching-tool/) - A computer version of a mechanical Chaos Simulator is a model for the unpredictability of physics, as well asinterpersonal and geopolitical interactions.
- [Don’t Let that Lying ChatGPT Trick You!](https://johnclarkeonline.com/2025/08/14/dont-let-that-lying-chatgpt-trick-you/) - Just because technology is easy to use, doesn’t mean it’s right. ChatGPT is renowned for its wide breadth of knowledge. As a scientist-writer, I use it almost daily to discover sources for my writing. For instance, to validate a strange storyline I knew zilch about, I gave ChatGPT the following prompt: “List examples of dead
- [The Earth is Not Our Property? Really?](https://johnclarkeonline.com/2025/08/01/the-earth-is-not-our-property-really/) - Are we the aliens on planet Earth? At least one brilliant and knowledgeable scientist thinks so. There was a good reason why a famous 1982 Spielberg movie was named “E.T. the Extraterrestrial.” For decades, “E.T.” was the initialism that American culture associated with Extraterrestrial Aliens, creatures from outer space. But now it isn’t in fashion.
- [Our World Could Have Ended in 2022](https://johnclarkeonline.com/2025/03/05/our-world-could-have-ended-in-2022/) - Most of us didn’t notice, but in October 2022 the Earth got its bell rung, a 1 in 10,000 year event. Three years before, I had written about just such an event.
- [Science Fiction Writers and the New UFO Report](https://johnclarkeonline.com/2021/07/08/science-fiction-writers-and-the-new-ufo-report/) - I thought the jig was up when I heard the top U.S. Intelligence Agency was releasing what it knew about UFOs. (See link at the bottom of this post.) Who would want to read a science fiction novel about UFOs and aliens when the truth is—as they say—stranger than fiction? What would happen to all
- [Confessions of a UFO Skeptic](https://johnclarkeonline.com/2021/09/07/confessions-of-a-ufo-skeptic/) - Some lines are risky to cross. The line separating fact from fantasy is one such line. What is remarkable to me about the U.S. government’s recent disclosure of the reality of UFOs, or UAPs, is that even those skeptics who have a reputation for rolling their eyes and bursting forth with ridicule have had to
- [My Weird, Spooky Body](https://johnclarkeonline.com/2021/11/13/my-weird-spooky-body/) - My body has a few unusual traits, or anomalies if you will. For most of those anomalies, science has attached a name. But those traits are still strange enough to make them worth describing. And a couple of them are, well, just plain weird. Sun Sneeze. Let’s start with an easy one. The so-called photic
- [Professional Diving, Truth, and the Uncertainty Principle](https://johnclarkeonline.com/2021/11/29/professional-diving-truth-and-the-uncertainty-principle/) - There is uncertainty in everything we do. Understanding the uncertainty in the testing of underwater breathing apparatus can save your dive, or your life.
- [When a Florida Rip Current Loses Its Way](https://johnclarkeonline.com/2023/07/01/when-a-florida-rip-current-loses-its-way/) - June 2023 saw deadly rip currents at Florida Panhandle Beaches, despite warnings. Tourists ignored safety measures, risking lives. Experts clarify that most rip currents lead back to shore, yet under severe conditions, swimming can be perilous. Safety is paramount; stay out during warnings. A rip current, a potentially deadly beach current, is often depicted as running straight out to sea. However, some rips bend back towards shore.
- [The Most Important News You Didn't See Coming](https://johnclarkeonline.com/2021/12/03/the-most-important-news-you-didnt-see-coming/) - Navy pilot encounters with UAPs reveal that someone has learned to manipulate space-time and master the workings of antigravity through space-time bubbles.
- [A Cloud of Smoke is No Way to Go](https://johnclarkeonline.com/2021/12/27/a-cloud-of-smoke-is-no-way-to-go/) - During wildfire season, air quality plummets, posing risk to millions of people. Along with limiting smoke exposure, proper mask wear is also critical.
- [Great Balls of Fire, Plasma](https://johnclarkeonline.com/2022/01/25/great-balls-of-fire-plasma/) - The first impression was that my childhood home had been firebombed. But what actually happened was far stranger. Physics and chemistry had gone wild.
- [Nighttime Prayers in War and Peace](https://johnclarkeonline.com/2022/03/15/nighttime-prayers-in-war-and-peace/) - The 2022 Russian invasion of Ukraine has brought clarity to many things we have long taken for granted, such as the ritual of putting children to bed at night.
- [Demystifying Rebreather Scrubbers, RF4 Malta](https://johnclarkeonline.com/2024/05/08/demystifying-rebreather-scrubbers-rf4-malta/) - Rebreather Forum 4, held in 2023 in Malta was yet another Herculean undertaking by Michael Menduno, the executive editor of Global Underwater Explorer’s (aka GUE) InDepth magazine and various international publications (see the above link for details.) Michael was the journalist who coined the term ‘technical diving”, and also created Aquacorp Magazine. I’ve known and
- [You Don’t Need a Tardis for Time Travel](https://johnclarkeonline.com/2024/06/05/you-dont-need-a-tardis-for-time-travel/) - Twice, I have been suspected of being a CIA Remote Viewer. I have no idea why. Harold Puthoff However, I have hosted the Ph.D. physicist and engineer Dr. Harold Puthoff, who initiated the CIA’s Remote Viewing program. Puthoff, best known currently as a theoretician in UFO propulsion systems within the UAP Disclosure effort, came to
- [Armageddon - Preparation for Visitors](https://johnclarkeonline.com/2024/09/14/after-the-war/) - Armageddon and Nuclear Winter is not all bad. Somehow, I survived, and my relatives, the Arvidx, are soon arriving.
- [Thank-you Sylvia Earle, the Lady of the Sea](https://johnclarkeonline.com/2025/01/26/the-lady-of-the-sea/) - After 52 years, I could finally thank a diving scientist of unbounded fame, Sylvia Earle.
- [Cosmic Coincidence](https://johnclarkeonline.com/2018/08/26/coincidence-or-cosmic-consciousness/) - Almost exactly a year ago, I began writing one of my third novel's introductory chapters. I am sharing a sample of that chapter at this time because of what seems to me to be a recently discovered coincidence. "A person can be born, grow old and die, but his or her energy goes on, somehow.
- [Dead Space - A Lesson in Survival](https://johnclarkeonline.com/2018/04/21/dead-space-a-lesson-in-survival/) - In diving, Dead Space is not a game.
- [Of Mussels and Whales](https://johnclarkeonline.com/2015/01/11/of-mussels-and-whales/) - It was a coincidence forty years in the making. I was recently at the Scripps Institute of Oceanography, talking to Scripps professor and physician Paul Ponganis about deep diving whales. He told me about the recent discovery that Cuvier's Beaked Whale, an elusive whale species, had been found to be the deepest diving of all whales. How deep
- [The Return of Souls - A Science Fiction Theme](https://johnclarkeonline.com/2015/01/04/we-dont-stay-dead-long/) - "I believe we don't stay dead long", said Robert Frobisher, a talented composer created by David Mitchell for his epic novel, "Cloud Atlas". I recently watched for the second time the complex and potentially disturbing movie adaptation of "Cloud Atlas." The first time I watched it I simply held on for the ride, trying to make sense of
- [On the Wrong Side of the Berlin Wall](https://johnclarkeonline.com/2013/01/08/on-the-wrong-side-of-the-berlin-wall/) - It was the time of Gorbachev and Détente; an uneasy and foolish Détente if you asked a certain Russian officer, which I did as we rode from the GKSS-GUSI deep diving facility in Geesthacht, Germany back into town. It was June 1990. The Russian did not know English, and I didn't know Russian, but the
- [GoPro, YouTube, and the Need for Speed](https://johnclarkeonline.com/2013/02/02/gopro-youtube-and-the-need-for-speed/) - Have you ever watched a local sailboat race from the shore? It's not exactly an adrenaline-pumping spectator sport. On the boats of course there is plenty of excitement — shouting, sometimes cursing. But from shore, all the on-boat drama is missing. GoPro cameras have ushered in a new era of taking the viewer into the action.
- [My Respiratory System is So Embarrassed](https://johnclarkeonline.com/2013/01/26/my-respiratory-system-is-so-embarrassed-2/) - "Respiratory embarrassment" is an uncommon phrase most likely spoken by physicians and physiologists. This week I found myself telling an engineer that “respiratory embarrassment can lead to an untoward event”. It quickly became apparent from the puzzled stare I received that I was not communicating. Scientists and some medical personnel tend to do that; fail to
- [To Elect a Mockingbird](https://johnclarkeonline.com/2014/12/20/to-elect-a-mockingbird/) - The days when Kings led their Army into battle are long gone. Not so, for princely animals who through loyalty, devotion, or instinct act at times with seemingly calculated personal abandon. It was a spring day when I stopped my car at an intersection, then made a gentle right turn onto a crossing street. In front of me,
- [Where Have All the Letters Gone?](https://johnclarkeonline.com/2014/06/24/where-have-all-the-letters-gone/) - When is the last time you wrote a letter to a family member or loved one? I'm not talking about email or text messages; digital communications do not count. I mean a letter on a piece of paper, placed in an envelope with a stamp, and mailed at a mailbox or post office; or in a very
- [What Is That Music?](https://johnclarkeonline.com/2014/04/20/what-is-that-music/) - The mark of great music is that you will always remember where you were and what you were doing when you first heard it. According to the Internet, Canon in D first became available to the masses through a 1970 recording, reportedly by the French musician Jean-Francois Paillard. Oddly, even though it was written in about
- [How Does Your Rebreather Scrubber Handle the Deep?](https://johnclarkeonline.com/2013/11/11/how-does-your-rebreather-scrubber-handle-the-deep/) - If you've planned a deep dive, to say 100 meters or deeper, you may have wondered just how your rebreather scrubber will handle that depth. Since pressure is equalized across a carbon dioxide (CO2) absorbent canister within a rebreather, it won't implode. But what about the chemical absorption reactions occurring within the scrubber? The
- [Is Your Local Ball Pit Safe for Children?](https://johnclarkeonline.com/2012/10/19/is-your-local-ball-pit-safe-for-children/) - I sat on the edge of a ball pit at Chuck E. Cheeses, calipers in hand, measuring the diameters of a random sampling of plastic balls within the pit. I suppose I stood out, an officious-looking adult wielding a precision instrument in a place designed for fun. So much so that a father attending his child
- [The Day the Gorillas Were Stopped at our Door](https://johnclarkeonline.com/2013/10/19/the-day-the-gorillas-were-stopped-at-our-door/) - I think one of the reasons I enjoy my grandchildren so much, and vice versa, is because they know they won't always get a serious answer from me. They sometimes call me "silly", but they do so with a smile. Silly is fun. Children will assuredly get an answer to any question they ask me
- [What Are Spammers Thinking?](https://johnclarkeonline.com/2013/08/11/what-are-spammers-thinking/) - I've noticed that from time to time normal, rational people comment on my blog posts. Unfortunately, their comments are usually lost in the noise. Where is the noise coming from? Well, spammers. Spam on blog posts is one of the most bizarre human or computer behaviors I have ever seen. And frankly, it makes no
- [Keep Your Powder Dry, Rebreather Divers](https://johnclarkeonline.com/2013/08/15/keep-your-powder-dry-rebreather-divers/) - Compared to decompression computers, digital oxygen control, and fuel cell oxygen sensors, carbon dioxide absorbent is low-tech and not at all sexy. Perhaps because it is low in diver interest, it is poorly understood. In rebreather diving, a lack of knowledge is dangerous. The U.S. Navy Experimental Diving Unit (NEDU) is intimately familiar with sodalime,
- [Cold Water Regulator Blues](https://johnclarkeonline.com/2013/10/04/cold-water-regulator-blues/) - It's a black art, the making of scuba regulators for use in polar extremes; or so it seems. Many have tried, and many have failed. Once you find a good cold water regulator, you may find they are finicky, as the U.S. Navy recently discovered. In 2013 the Navy invested almost two hundred hours testing
- [The First Time Ever I Saw Your Face](https://johnclarkeonline.com/2013/03/03/the-first-time-ever-i-saw-your-face/)
- [Introducing Our Galaxy to a Child](https://johnclarkeonline.com/2011/09/04/introducing-our-galaxy-to-a-child/) - A clear night with our Milky Way galaxy seeming to glow iridescently is unforgettable. I remember seeing it once as a child, looking up from a field in the darkness of rural Texas, once from the deck of a rolling ship in the tropics, once from my aircraft on a beautiful night flight headed home, and
- [Outsmarted by an Octopus](https://johnclarkeonline.com/2011/07/02/outsmarted-by-an-octopus/) - Jim Duran and I started a night dive in about sixty to seventy feet of water several miles off the beaches of Panama City, FL. I was wearing double 80 tanks, held a collecting bag and lights, and fully intended to capture an octopus, alive. At the time I was working in an invertebrate physiology laboratory
- [How Musicians and Pilots Are Alike - It's in the Chords](https://johnclarkeonline.com/2011/06/14/how-musicians-and-pilots-are-alike-its-in-the-chords/) - I've suffered from chord envy for years. No, I'm not talking about the chord of aircraft wings and some etymological, coincidental semblance to musical chords. No, the problem is much more serious. You see, I’m a woodwind player, a clarinetist to be exact, and like brass players, I can’t play chords. A chord is a musical
- [Why Deep Saturation Diving Is Like Going to the Moon, and Beyond](https://johnclarkeonline.com/2011/07/17/why-deep-saturation-diving-is-like-going-to-the-moon-and-beyond/) - This week, as the Space Shuttle is making its last circuits around our planet, I lament what has happened to our space program. Yet, I am reminded of another exploration program that has, like the shuttle and the moon programs, reached incredible milestones only to retreat to a less exotic but still impressive status. That other
- [How to Teach Ice Diving When the Arctic Is Melting](https://johnclarkeonline.com/2011/07/21/how-to-teach-ice-diving-when-the-arctic-is-melting/) - In 2007 Michael Lang of the Smithsonian Institution's Scientific Diving Program sponsored a spring-time ice diving course in the high Arctic at Ny-Ålesund, Svalbard, in an area generally called Spitzbergen. Ny-Ålesund, an international Arctic research town situated at 78°56'N, 11°56'E, is the most northern continuously operated community. It sits on the shore of a fjord called Kongsfjorden. In
- [If You Were a Human-Animal Hybrid, What Would You Want to Be?](https://johnclarkeonline.com/2011/07/27/if-you-were-a-human-animal-hybrid-what-would-you-want-to-be/) - James Patterson's Maximum Ride series about a flock of flying kids is, for me at least, some of the most interesting reading a bird man (aka aviator, pilot) is likely to find in an airport bookstore. What a fun way to spend a cross-country flight! Even though Patterson's series is written for adolescents, it fulfills in me
- [Broken Sparrow - Everyone Loves a Fighter](https://johnclarkeonline.com/2011/06/23/broken-sparrow-everyone-loves-a-fighter/) - What on earth could make a blog posting on a sparrow worth reading? Well, people love stories of near tragedy, survival, and salvation, and this has some elements of them all. A nesting pair of House Sparrows showed up at work this Spring, hidden in the metal framework of a second-story bridge connecting two brick buildings of
- [My Family's Exciting Flight with the Navy's First Ace](https://johnclarkeonline.com/2011/04/14/my-familys-exciting-flight-with-the-navys-first-ace/) - Sometimes weather makes for an altogether bad flying day. The luxurious turboprop was speeding through turbulent skies, using its radar to pick its way around southern thunderstorms, en route to a quail hunting plantation just across the Georgia-Florida border. The craft had left Cleveland with my wife and one-year old son on board. Occasionally the
- [Living Off Universal Energy. Really?](https://johnclarkeonline.com/2017/06/23/living-off-universal-energy-really/) - I thought I was misreading the title of the news article. I adjusted my glasses, then looked again. Sure enough, the news headlines this past week actually reported on a young couple, reportedly a Breatharian couple, who claimed they had no need for food. They lived off of Universal energy, whatever that is. Most amazingly, the news-hungry press
- [Only Classical on Sunday](https://johnclarkeonline.com/2011/04/11/only-classical-on-sunday/) - Music Appreciation classes notwithstanding, I sense that the best way to become absorbed in music is to sit in the middle of it, in an orchestra or choir, and to be part of the organic music-making machine. Although I am not from a strongly musical family, my mother was a dancer and dance instructor. My
- [What Will Divers Do When  the Helium is Gone?](https://johnclarkeonline.com/2021/03/05/what-will-divers-do-when-the-helium-is-gone/) - Helium is a low density, non-narcotic gas often added to the breathing gas mixture of divers who have to dive deep. Nitrogen, the primary component of air is both dense, making it hard to breathe when diving deep, and narcotic at depths below one hundred feet. That is why nitrogen leads to the so-called “rapture
- [Nuclear Incident at Georgia Tech](https://johnclarkeonline.com/2021/04/17/nuclear-incident-at-georgia-tech/) - Large scale nuclear accidents like those at Chernobyl and Fukushima are environmental disasters which grab the headlines. But lesser accidents do occur, just as in any industrial facility. I was involved in one such incident. From the mid-sixties to the mid-nineties, Georgia Tech had a research reactor which served a multitude of research purposes. It
- [Phobos, Chariot of Fear](https://johnclarkeonline.com/2019/01/30/phobos-chariot-of-fear/) - While the above video is aesthetically pleasing because of the background stars and the entirety of Mars being in the field of view (FOV), in reality Mars is too far away in this simulation. As the NASA movie suggests, the surface of Mars is much closer (about 6000 km away from Phobos), and thus in
- [The Basic Chemistry of Nitrogen Dioxide](https://johnclarkeonline.com/2020/08/07/poisonous-gas-in-the-beirut-explosion-and-the-novel-atmosphere/) - “The U.S. President was on the phone with the President of China when a video from the International Space Station came in from the NASA feed to the Emergency Operations Center. A huge burnt-orange cloud was covering the entire southern Pacific, extending all the way up to Hawaii and down to New Zealand. This was
- [When Heat Pumps Become Killing Machines](https://johnclarkeonline.com/2019/07/02/heat-pumps-as-killing-machines/) - Heat pumps good for people - bad for lizards.
- [Ocean on Top](https://johnclarkeonline.com/2019/12/12/ocean-on-top/) - Hal Clement wrote about living on the ocean floor - in a bubble of perfluorocarbon.
- [Happy Hypoxia - A 2018 Warning](https://johnclarkeonline.com/2020/05/10/happy-hypoxia-a-2018-warning/) - Happy hypoxia happened to me after a visit to Thailand.
- [Bubble Submarines Resurface After Fifty-Two Years](https://johnclarkeonline.com/2019/12/21/bubble-submarines-resurface-after-fifty-two-years/) - Bubble submarines were new - 52 years ago.
- [Pendelluft—The Beast Within](https://johnclarkeonline.com/2020/07/21/pendelluft-the-beast-within/) - A COVID-like illness produced alien breath sounds within my chest.
- [Where is Pham-lỷ-Täi?](https://johnclarkeonline.com/2020/08/18/where-is-pham-ly-tai/) - The word “pen pals” was recently in the news. In the 1960s, students were taught U.S and World History. Long before the days of personal computers and the Internet, we high school students were encouraged to expand our perspective by becoming pen pals with other students around the world. Of course, back then, the phrase
- [Canoeing the Little Nianqua River in the Ozarks](https://johnclarkeonline.com/2021/02/22/canoeing-the-little-nianqua-river-in-the-ozarks/) - Enjoy canoeing the river, but be careful where you tread.
- [The Blood of a Forest](https://johnclarkeonline.com/2021/03/25/the-blood-of-a-forest/) - A dead forest bleeds for years, its decomposition products flowing slowly into the soil, leached out by rains to turn tributaries as black as night. Those dark tributaries join forces, darkening streams heading inexorably to the sea. At last, the blood of the forest flows out into the surf zones, spreading a dark brown stain
- [Maintaining Your Respiratory Reserve](https://johnclarkeonline.com/2021/03/10/maintaining-your-respiratory-reserve/) - The following is a reprint from InDepth: Digital Scuba Diving Magazine by Global Underwater Explorers. Published on September 6, 2019 By InDepth by John Clarke Just like skeletal muscles, respiratory muscles have a limited ability to respond to respiratory loads. An excellent example of this is a person’s inability to breathe through an overly long
- [Hydrogen Diving: The Good, The Bad, the Ugly](https://johnclarkeonline.com/2021/03/07/hydrogen-in-diving-the-good-the-bad-the-ugly/) - In the preceding blog post, I reminded the reader that the Earth’s supply of helium is limited. It is not a renewable resource. Being a diving professional, I am not concerned about the consequence of a helium shortage on party balloons. But I am thinking about the potential consequences on diving. So, knowing that hydrogen
- [The Sinking of the Montrose](https://johnclarkeonline.com/2021/02/26/the-sinking-of-the-montrose/) - “If it had been a snake, it would’ve bit me.” That phrase is common in the Southern United States, often shouted in surprise when you’re vainly looking for something, and eventually discover it right in front of you. Well, here’s an example of when the snake did bite, figuratively, and ended up sinking a ship.
- [Warning Order](https://johnclarkeonline.com/2020/05/27/warning-order/) - The COVID Task Force requested a new ventilator.
- [If I Had Written the Score to Interstellar](https://johnclarkeonline.com/2018/02/03/if-i-had-written-the-score-to-interstellar/) - When the score of Interstellar deserved center stage.
- [Autohemotherapy Saved My Brother](https://johnclarkeonline.com/2020/08/30/autohemotherapy-saved-my-brothers-life/) - In 1940, my older brother, Albert, was born prematurely, with a severe case of ichthyosis (skin with scales like fish.) Due to Albert’s prematurity, at birth his entire body fit in the palm of my father’s hand. Albert had no suckling reflex, and so the pediatrician said there was nothing that could be done to save him.
- [The Lifetime Gift of Music Education](https://johnclarkeonline.com/2016/07/24/the-lifetime-gift-of-music-education/) - Of all the things I accomplished in secondary school, the one that still brings joy to my heart and tears to my eyes is the music I performed in the Symphonic Wind Ensemble at Shawnee Mission East High School in Prairie Village, Kansas. Under the steady guidance of Mr. Kenneth Geoffroy, our marching band, orchestra and Wind Ensemble director,
- [Liquid Breathing - It's Not As Easy as It Looks](https://johnclarkeonline.com/2011/06/20/liquid-breathing-its-not-as-easy-as-it-looks/) - Who can forget James Cameron's movie The Abyss! If I need to remind you, Cameron is the creator of Avatar. The Abyss was an imaginative movie of the 1980s, where the plot concerned commercial divers who had been hired by the Navy to assist with the salvage of a nuclear submarine. It involved very deep diving, and special
- [Hydrogen Diving - A Very Good Year for Fiction](https://johnclarkeonline.com/2018/09/01/hydrogen-diving-a-very-good-year-for-fiction/) - Two novels on hydrogen diving published in 2017
- [Siri versus Napoleon Bonaparte](https://johnclarkeonline.com/2018/08/21/siri-versus-napoleon-bonaparte/) - SIRI critiques a wrongly overheard conversation
- [A Matter of Chance: Music Makes the Video](https://johnclarkeonline.com/2017/11/19/a-matter-of-chance-music-makes-the-video/) - I was recently asked to give a 30-minute after-dinner talk to the 3CPR Resuscitation Panel of the American Heart Association at their annual scientific meeting in Anaheim, CA. In the audience were scientists, cardiologists, anesthesiologists, anesthetists, emergency physicians, and resuscitation technicians. It was a multimedia event with professionally managed sound and video. Knowing that the group would be
- [Cereal Was Almost the Death of Me](https://johnclarkeonline.com/2017/09/09/cereal-was-almost-the-death-of-me/) - This year, 2017, marks the 120th year that Grape Nuts cereal has been in existence. Generations have been raised on it, and as the 1921 ad would suggest, it seems to help little bodies grow big and strong. As the Post company says, "There's a Reason" for the cereal's success. However, through some weird quirk,
- [DNA: A Matter of Trust](https://johnclarkeonline.com/2017/05/27/dna-a-matter-of-trust/) - In combat, we trust our buddies with our lives. We have their back and they have ours. When submitting to surgery, we trust the medical team with our lives, and usually that trust is not betrayed. But should we be willing to trust strangers with our very essence, our DNA? Recently I was trying to solve a plot problem
- [Transcontinent Love and War](https://johnclarkeonline.com/2016/11/24/transcontinent-karma/) - Middle aged guys are a sucker for a pretty face, as this odiferous saga proves. I was headed overseas from New York to Paris, which is always a relatively painful transcontinental experience back in the Economy section. But my trouble started even before we left the gate. I had selected an aisle seat near the
- [I Too Landed at the Wrong Airport](https://johnclarkeonline.com/2014/01/20/i-too-landed-at-the-wrong-airport/) - As a professional in underwater diving, and an amateur airman, I've been thinking a lot lately about the causes of accidents and "near-misses". If you're reading this in early 2014, you are no doubt aware of several recent incidents of commercial and military jets landing at the wrong airport. In the latest case there was
- [U.S. Navy Diving and Aviation Safety](https://johnclarkeonline.com/2016/07/27/the-u-s-navy-and-aviation-safety/) - Blood pressure is not the only silent medical killer. Hypoxia is also, and unlike chronically elevated blood pressure, it cripples within minutes, or seconds. Hypoxia, a condition defined by lower than normal inspired oxygen levels, has killed divers during rebreather malfunctions, and it has killed pilots and passengers, as in the 1999 case of loss of
- [A Geometric Mind](https://johnclarkeonline.com/2016/05/28/a-geometric-mind/) - I challenge you to describe the following images in terms of simple geometric shapes: shapes such as rectangles and circles, and flat surfaces called planes. If you see one of those shapes in the image, then mentally note it. You may not be able to completely define the image with those simple shapes, but at least note those
- [How Will You Try to Kill Me?](https://johnclarkeonline.com/2016/04/24/how-will-you-try-to-kill-me/) - It's been over three years since I posted a cautionary tale about oxygen sensors in rebreathers, and the calamities they can cause. Since then, the toll of divers lured to their death has been steadily mounting. In one week alone in April 2016, at almost the same geographical latitude in Northern Florida, there were two diving fatalities
- [The Siren's Call of Rebreather Oxygen Sensors](https://johnclarkeonline.com/2012/12/28/the-sirens-call-of-rebreather-oxygen-sensors/) - In Greek mythology irresistibly seductive female creatures were believed to use enchanted singing to beckon sailors to a watery grave. Why this myth endured through the centuries is difficult to say. However, my theory is that it helped explain to grieving widows and mothers why ships sometimes inexplicably disappeared, taking their crew with them, never to be seen
- [In the Claws of a Monster](https://johnclarkeonline.com/2016/04/16/in-the-claws-of-a-monster/) - Nature does not always provide good options. When faced with weather-related adversity, making the right decision can be as much a matter of luck as wisdom. Homerville, Georgia is the home of some first-rate southern barbeque and home of one of the best genealogical libraries in the Southeast, the Huxford Geneological library. In June of 1975 I
- [Where Things Move Quickly and Darkly](https://johnclarkeonline.com/2015/12/27/where-things-move-quickly-and-darkly/) - I came across a great article from the New Yorker with an interesting title. In fact, my interest lasted all the way to the end. Spooked: What do we learn about science from a controversy in physics? If you get the feeling that science is not as pure of thought and logic as it pretends to
- [Remote Viewing - Stretching the Limits of Science in Fiction](https://johnclarkeonline.com/2015/12/04/remote-viewing-stretching-the-limits-of-science-in-fiction/) - I once met the Father of the U.S Remote Viewing program, unawares. A decade ago, at the request of a Navy engineer who ended up being a character in my novel Middle Waters, I invited Dr. Harold E. Puthoff into the Navy Experimental Diving Unit to give a talk on advanced physics. He had attracted a small
- [Eating Crow - Safe Water Temperatures for Scuba Regulators](https://johnclarkeonline.com/2015/10/14/eating-crow-safe-water-temperatures-for-scuba-regulators/) - Scientists and engineers love to argue, and unlike the case with politicians, compromise is not an option. Technologists speak for nature, for the truth of a universe which does not speak for itself. But when a technologist is wrong, they usually have to eat some crow, so to speak. Stephen Hawkings, the famous cosmologist, freely admits his brilliant doctoral dissertation was
- [Diving a Rebreather in Frigid Water: Canister Concerns](https://johnclarkeonline.com/2015/07/30/diving-a-rebreather-in-frigid-water-canister-concerns/) - As evidenced by Under the Pole diving expeditions, rebreathers are being used in some of the most isolated and frigid places in the world. Some of those dive missions are surprisingly deep (111 meters, 330 feet) and long, about 2 hours. That gives me cause for pause. I suspect most divers are aware of the
- [Burn My New State Flag - I Don't Care](https://johnclarkeonline.com/2015/07/11/burn-my-new-state-flag-i-dont-care/) - I've decided to invent a new series of non-controversial flags for all 50 states of the United States of America. I began with a plain white flag. Not much to be controversial about there. (By the way, I was not the first to think of that.) Then I proposed adding to each state flag the
- [A Novel - A Song Just Waiting to Bust Out](https://johnclarkeonline.com/2015/06/11/a-novel-a-song-just-waiting-to-bust-out/) - One of the most memorable quotes I've heard from a child came from his experience listening to classical music. I don't remember who said it (Google comes up empty-handed), but I've never forgotten it. "A symphony is music with a song waiting to bust out any minute." Those words were the child's response to listening to a
- [Authorized for Cold Water Service: What Divers Should Know About Extreme Cold](https://johnclarkeonline.com/2015/06/01/authorized-for-cold-water-service-what-divers-should-know-about-extreme-cold/) - The following is reprinted from my article published in ECO Magazine, March 2015. It was published in its current format as an ECO Editorial Focus by TSC Media. Thank-you Mr. Greg Leatherman for making it available for reprinting. It is the highpoint of your career as an environmentally minded marine biologist. The National Science Foundation
- [I Remember Nothing After the First Bounce](https://johnclarkeonline.com/2015/04/10/i-remember-nothing-after-the-first-bounce/) - "It was a gorgeous day to jump from a perfectly good airplane. I, Mickey McGurn, was good at it, and I got paid well to do it. But one day I got careless. It was 1927, and parachute jumping was a new thing on the barnstorming circuit. It made people catch their breath when I jumped out
- [After the Heart Attack - The Healing Power of Athletic Passions](https://johnclarkeonline.com/2015/02/28/after-the-heart-attack-the-healing-power-of-athletic-passions/) - There is nothing quite like a heart attack and triple bypass surgery to get your attention. Even if you've been good, don't smoke, don't eat to excess, and get a little exercise, it may not be enough to keep a heart attack from interrupting your life style, and maybe even your life. Post-surgical recovery can be slow
- [A Salute to Warriors](https://johnclarkeonline.com/2015/01/25/a-salute-to-warriors/) - It was a moment in time that no one had expected. Through a twist of fate I found myself standing in the midst of warriors; warriors dressed in civilian clothes, waiting for a ride somewhere. They sat on the floor, propping themselves up against walls, wasting no energy, efficient even in their resting. They had
- [Blood, as a Delicacy, Is Underrated](https://johnclarkeonline.com/2015/01/16/blood-as-a-delicacy-is-underrated/) - Those words earned me a first place prize of $20 in a contest for the best first line in a comic vampire novel. The contest was held during the 2010 Ozark Creative Writers’ Conference in Eureka Springs, Arkansas. Not that I would ever write a vampire novel, comic or otherwise, but I guess it proved
- [How to Read an e-Book](https://johnclarkeonline.com/2014/12/31/how-to-read-an-e-book/) - In days not too long past, proper lighting and posture were the keys to enjoyable and prolonged reading comfort. Now, things have changed. When reading by candle light, you placed your reading material in close proximity to the candle, and placed your chair in as comfortable a position as could be managed. Electric lighting, by
- [How to Create a Motorcycle Salesman in Five Easy Minutes?](https://johnclarkeonline.com/2014/12/15/how-to-create-a-motorcycle-salesman-in-five-easy-minutes/) - I used to own a Honda 350 motorcycle and drove it about 35,000 miles before I sold it. But that was long ago. But still, there was a history. Such a good history, in fact, that of late I've been admiring a fellow's 175 cc Honda of the same style and vintage as mine. But I'm not
- [Redundancy - a Life Saver in Diving and Aviation](https://johnclarkeonline.com/2014/11/01/redundancy-a-life-saver-in-diving-and-aviation/) - I was recently flying a private aircraft down the Florida Peninsula to Ft. Lauderdale to give a presentation on diving safety. As I continually checked the cockpit instruments, radios and navigation devices, it occurred to me that the redundancy that I insist upon in my aircraft could benefit divers as well. In technical and saturation
- [Don't Dive Cold When You Don't Have To](https://johnclarkeonline.com/2014/12/06/dont-dive-cold-when-you-dont-have-to/) - Clarke JR1, Moon RE2, Chimiak JM3, Stinton R4, Van Hoesen KB5, and Lang MA5,6. 1 US Navy Experimental Diving Unit, Panama City, Florida 2 Duke University, Durham, North Carolina 3 Divers Alert Network, Durham, North Carolina 4 Diving Unlimited International, Inc., San Diego, California 5 UC San Diego - Emergency Medicine, San Diego, California
- [When Cars Can Tweet](https://johnclarkeonline.com/2014/09/13/when-cars-can-tweet/) - I was quite surprised when I learned that the U.S. government is mandating, and U.S. engineers are devising, ways for cars to share messages about their status, speed, and location. That is, they will be talking to each other. What will that talking sound like? Well, I don't think its going to be like Mater in
- [Does Your Rebreather Scrubber Operate in Its Goldilocks Zone?](https://johnclarkeonline.com/2014/08/17/does-your-rebreather-scrubber-operate-in-its-goldilocks-zone/) - In space, there is a so-called Goldilocks zone for exoplanet habitability. Too close to a star, and the planet is too hot for life. Too far from its star, and the planet is too cold for life, at least as we understand biological life, life dependent on water remaining in a liquid state. Earth is clearly in
- [My Medicines Saved my iPhone](https://johnclarkeonline.com/2014/08/09/my-medicines-saved-my-iphone/) - I've heard about all sorts of disasters with smartphones, and other small, portable electronic devices. Being small and portable makes them easy to drop — something I've personally witnessed. Phones are tough by design, but they really don't like water. Drop one in a toilet while you're relaxing, and it's gone — for all practical purposes. So I had
- [I am Neanderthal, Pt. 3](https://johnclarkeonline.com/2014/07/13/i-am-neanderthal-pt-3/) - I feel like a seeded watermelon. Ever since I was created by the curiosity of government and university scientists, I have lived through no efforts of my own. I have the largesse of the U.S. government to thank for that. You see, they paid for the research that created me. And now, I contribute nothing
- [How Cold Can Scuba Regulators Become?](https://johnclarkeonline.com/2014/05/25/how-cold-can-scuba-regulators-become/) - The Arctic science diving season is in full swing (late May). Starting in September and October, the Austral spring will reach Antarctica and science diving will resume there as well. Virtually all polar diving is done by open-circuit diving, usually with the use of scuba. As has often been reported, regulator free flow and freeze up
- [Do All Boys Cause Their Mother Grief, or Is It Just Me?](https://johnclarkeonline.com/2014/05/14/do-all-boys-cause-their-mother-grief-or-is-it-just-me/) - Mother's Day 2014 has come and gone, but not without my thinking of the grief I caused my ever patient, ever tolerant, and certainly loving Mother. I think the only time when I didn't surprise her was when I was born. She always called me "Johnny on the Spot" since I was apparently born on
- [Nightmarish Thoughts of Being Eaten](https://johnclarkeonline.com/2014/03/30/nightmarish-thoughts-of-being-eaten/) - There is a downside to situational awareness. I discovered this fact while 868 miles north of the Arctic circle, 600 miles south of the North Pole. It took place in Ny-Ålesund, Svalbard, a part of the well-known island Spitsbergen. I was helping the Smithsonian Institution train divers in polar diving. My job was to teach them
- [Half Magic](https://johnclarkeonline.com/2014/03/20/half-magic/) - Long before J. K. Rowling began writing the wildly popular Harry Potter series of books on children and magic, Edward Eager wrote a similar themed book in the 1950s. In my child’s mind at that time, Eager’s book, Half Magic, was one of the most remarkable and memorable books I’d ever read. In fact, it
- [The Tragicomic Consequences of Bad Timing](https://johnclarkeonline.com/2014/03/16/the-tragicomic-consequences-of-bad-timing/) - They say that in comedy, timing is everything. Well, on this day my timing was badly off. My brother was born five years before me, and of my siblings was the one with the most direct interaction with me as I was growing up. We shared life experiences, and apparently we shared the same quirky
- [Root Causes: Some Accidents Are No Accident](https://johnclarkeonline.com/2014/02/13/root-causes-some-accidents-are-no-accident/) - Interesting flights and interesting dives provide an opportunity for post-event introspection; debriefing if you will. Professionally, I am called upon to analyze fatalities and near-misses for the Navy and, occasionally, the Air Force. Personally, I spend even more time analyzing "what ifs" for my own activities. For example, recently I was preparing a video of
- [The Patients, the Pilot, and the Politicians](https://johnclarkeonline.com/2014/01/29/the-patients-the-pilot-and-the-politicians/) - Every night a pilot from Atlanta makes a round-robin cargo flight to Albany GA and Dothan AL, then continues down to the coast to load cargo from Panama City FL, Pensacola, and Mobile AL before returning home. He used to fly a single engine Beech Bonanza, but now pilots a Baron, a twin-engine, 190 kt
- [There Are No Bad People, Just Bad Code](https://johnclarkeonline.com/2014/01/24/there-are-no-bad-people-just-bad-code/) - Lately I have been puzzled by news reports about fellow scientists who are thinking not just out of the box, but out of the universe. The first news that had me struggling was the suggestion that a universe might be the projection of a hologram. Not our universe, necessarily, but some artificial, mathematically contrived universe.
- [The Turtle Who Came to Swim](https://johnclarkeonline.com/2014/01/04/the-turtle-who-came-to-swim/) - The recent Comcast Xfinity ad campaign featuring the animatronic tortoises Bill and Karolyn Slowsky reinforces the attitude that turtles, or tortoises to be exact, are slow moving. Occasionally a surprisingly large turtle lumbers through our yard. Sometimes we spy a baby, or perhaps an adolescent. And true to expectations, they are all painfully slow. Well, let's
- [The Aesthetics of Flying in Clouds](https://johnclarkeonline.com/2013/11/24/the-aesthetics-of-flying-in-clouds/) - When it comes to vocations and avocations, I know of none more aesthetically pleasing than flying and diving. I'm sure there are many others, but I simply don't know them. My vocation is diving, and flying is my avocation. I also know commercial pilots who dive in caves simply for the joy of diving. Those
- [Those Curious Manganese Nodules: from Intelligence History to Science Mystery](https://johnclarkeonline.com/2011/05/08/those-curious-manganese-nodules-from-cia-history-to-science-mystery/) - Shortly before Howard Hughes’ massive ship, the Glomar Explorer, conducted a secret mission to recover a sunken Soviet submarine in the Pacific, under the guise of collecting manganese nodules, a much smaller Research Vessel was collecting the real thing, on the Blake Plateau about 150 miles southeast of the Georgia-Florida Coast . In 1970 I
- [The Positive Side of Internet Data Gathering](https://johnclarkeonline.com/2013/10/27/the-positive-side-of-internet-snooping/) - There is a good reason why God and aliens (of the extraterrestrial variety) use telepathy to communicate. It is the only secure form of information transmission. Everything else is subject to capture, storage, and retrieval. There is currently a frantic paranoia spawned by national and international agency's collection of virtually everything we say and do.
- [Phytophotodermatitis and the Fig Tree from Hades](https://johnclarkeonline.com/2013/10/14/phytophotodermatitis-and-the-fig-tree-from-hades/) - My fig tree is a diabolical, horticultural menace sprouted from a demon seed. I've tried to kill it, but it won't die. In general, I love trees, and figs, but this particular fig tree (Ficus carica for the Latin purists out there) has sorely offended me. It has attacked me, causing, as they say, bodily
- [The Immigrants in My Backyard](https://johnclarkeonline.com/2013/09/09/the-immigrants-in-my-backyard/) - I admit it; I have long been angry at the immigrants living in my backyard. When I moved my family back to Florida over twenty years ago, I was thrilled by the sight of the beautiful green anoles (lizards) scampering over the white stucco walls of our house. But over the years the native green
- [The Sojourner's Dilemma; You Have to Go Home Sometime](https://johnclarkeonline.com/2013/08/26/the-sojourners-dilemma/) - There are sports, there are professions, then there are sojourns. Astronauts are sojourners, as are pilots and mountain climbers and underwater divers. While the sojourner may have carefully planned his sojourn, warding off potential trouble by using good equipment and training, it is the return to normalcy that oftentimes presents the greatest and most unexpected
- [Last Man Standing](https://johnclarkeonline.com/2013/08/06/last-man-standing/) - It seems ironic that at the same time that equality of the sexes in marriage is being heavily promoted, there is a scientific announcement that the male of the human species is anything but equal; we are genetically weak. According to at least one female scientist, human males are destined to die out due to the
- [The Battle of Tiny Titans](https://johnclarkeonline.com/2013/07/31/the-battle-of-tiny-titans/) - Seen up close, the contestants in this battle were impressive. One was a male Broad Headed Skink native to the Southeastern United States. The other was a male Minotaur Beetle. The insect contestant was plucked off a log in Atlanta, Georgia. The Broad Headed Skink was scooped off a red brick wall of a house in
- ["Keep the Placenta and Throw Away the Baby"](https://johnclarkeonline.com/2013/06/23/keep-the-placenta-and-throw-away-the-baby/) - On the occasion of the birth of my daughter's second child, I was reminded of one of the strangest medical conversations I've ever had. It occurred during the birth of my daughter, our second child. I was on the staff of Shands Hospital and University of Florida School of Medicine, Gainesville, FL. My wife was pregnant with
- [I am Neanderthal, Pt. 2](https://johnclarkeonline.com/2013/06/08/i-am-neanderthal-pt-2/) - The gleam in my father's eye came in 2013. That is when it all started for me, years before my birth. I am more than a little annoyed by that. In my searching of the archives trying to learn of my roots, I came across a 2013 article discussing the debatable morality of recreating the
- [The Magic of a Perfectly Proportioned Body](https://johnclarkeonline.com/2013/05/14/the-magic-of-a-perfectly-proportioned-body/) - I was challenged to a race by a five-year old little girl. If I was not so amazed by the outcome, I would be humiliated. When I say little girl, I mean really little, like 38 pounds and about three and a half feet tall, with spindly arms and skinny legs. She was a little
- [Not Exactly a Horse Whisperer](https://johnclarkeonline.com/2013/05/04/not-exactly-a-horse-whisperer/) - I have always been kind to animals, but for some reason animals have not always been kind in return. Case in point; horses. While dating the girl who eventually became my wife, I was given a chance to prove my manhood by riding one of two horses. She chose her friend's horse, a sedate, well-trained Palomino quarter horse
- [I am Neanderthal](https://johnclarkeonline.com/2013/04/10/i-am-neanderthal/) - I suppose it was inevitable that I would be different; the ultimate “n” of one, the rarest species in the universe, the only Neanderthal on Earth. By human standards I am very spiritual; I can remember my time before incarnation. I was told that I would be given a unique opportunity to excel in this
- [Children of the Middle Waters](https://johnclarkeonline.com/2011/12/10/children-of-the-middle-waters/) - Children of the Middle Waters (working title) is a science fiction/thriller that has been completed and is being submitted today for consideration by Tom Doherty Associates, New York. My friend and mentor, the writer Max McCoy, has provided literary criticism and encouragement for the manuscript. Max, who works primarily in the Western genre, wrote a diving-related
- [The Dinosaur in the Window](https://johnclarkeonline.com/2013/02/22/the-dinosaur-in-the-window/) - Even a child can appreciate the strangeness of watching the broad, glistening side of a dinosaur lumbering past the bedroom window. Fortunately the creature paid me no heed; it didn't pause to look in the window, just kept moving on, quickly disappearing from view. I lay there, frightened I suppose, but all I remember in detail very many years later
- [The Google Generation and College Life](https://johnclarkeonline.com/2013/02/10/the-google-generation-and-college-life/) - I was recently reminded that almost everyone who is literate and has access to a computer and Internet connection has used Google to find something of interest to them. The way I was reminded of that was from Google Analytics which gives me feedback on this blog. Over a period of a few days I
- [A Conversation with a Cloud](https://johnclarkeonline.com/2013/01/27/a-conversation-with-a-cloud-2/) - I lay on the summer grass with a young lady friend of mine. We were holding hands affectionately, talking softly about nature, love, and a future that was fated never to happen. As we talked about nothing of lasting importance, I pointed to a dying cloud. All of the clouds drifting lazily overhead were dying
- [In Search of Glories](https://johnclarkeonline.com/2012/12/16/in-search-of-glories/) - Recently my inner child took notice of a circle of light racing across the cloud tops as I cruised at 7000 feet and 180 mph with the prevailing westerlies at my back. I was headed east above the Gulf Coast between New Orleans and the Florida Panhandle, and the late afternoon sun crept ever lower behind
- [Would You Rather Face a Cunning or Relentless Foe?](https://johnclarkeonline.com/2012/11/25/would-you-rather-face-a-cunning-or-relentless-foe/) - Suppose you find yourself on an alien planet, battling with indigenous species. On your side, you have smarts, both natural and technological. The alien defenders have nothing; no technology. Well, they do have slime, but that's all. Brains against the brainless: Who do you think will win? I spent a summer weekend with my family in a cabin
- [Carbon Dioxide - The Diver's Nemesis Pt. 1 (Meduna's Mixture)](https://johnclarkeonline.com/2012/01/22/carbon-dioxide-the-divers-nemesis-pt-1-medunas-mixture/) - Of all the gases humans excrete, the most bountiful, and arguably the most deadly, is exhaled carbon dioxide. There is a forgotten bit of American medical history that reveals the bizarre features of the toxicity of carbon dioxide. In 1926, before the advent of modern psychiatric medications, some American psychiatrists began experimenting with the use of
- [In Diving, What is Best is Not Always Good](https://johnclarkeonline.com/2012/11/14/in-diving-what-is-best-is-not-always-good/) - In technical or recreational rebreather diving, safety is a matter of personal choice. Wrong choices can turn deadly. Some poor choices are made for expediency, while others are made with the best of intentions but based on faulty or incomplete information. As a diving professional, it is those latter choices that concern me the most. A
- [The Relevance of Genealogy in a Mormonism-Awakening World: or My Ancestors Did What?](https://johnclarkeonline.com/2012/10/25/the-relevance-of-genealogy-in-a-mormonism-awakening-world-or-my-ancestors-did-what/) - Recent science has revealed that we, Homo sapiens, may be carrying genes from the Neanderthals, like the model on the left reconstructed from a nearly complete skeleton discovered 100 years ago in France. But what about our other genes, those contributed by our family ancestors? The quest for family roots is old, and has kept
- [Making Fuel](https://johnclarkeonline.com/2012/10/17/making-fuel/) - While watching an "Ice Pilots" episode on the Weather Channel I heard a pilot of a Curtiss C-46 Commando talking to his inexperienced copilot during a flight. At one point he said they were "making fuel." I have enough common sense and experience as a pilot to know that could not be literally true. But
- [Frequently Asked Questions About Personal Black Holes](https://johnclarkeonline.com/2012/09/23/frequently-asked-questions-about-personal-black-holes/) - Thank-you for contacting Cosmic Capacity Corporation's FAQ regarding our popular Personal Black Hole Product. 1. The price of your product seems astronomical. Will there be equally large maintenance fees? As they say, if you have to ask, you can't afford it. But keep in mind, science has shown that if your PBH is not properly
- [Gas with Your Water?](https://johnclarkeonline.com/2012/09/22/gas-with-your-water/) - "Water with gas?" the waiter asked. "Can you be more specific?" I queried. With a sardonic sneer typical of the glistening-haired, easily-bored waiters in upper crust restaurants, he poked a neatly manicured finger into my menu. "It's right there. You chose carbon dioxide or methane." Even though that conversation is imaginary, it is true, apparently, that
- [Maximum Parsimony - In Diving and the Cosmos](https://johnclarkeonline.com/2012/09/02/maximum-parsimony-in-diving-and-the-cosmos/) - I admit it, my early training in physics has made me irritatingly sensitive to the principle of parsimony. Parsimony, pronounced similarly to "alimony", can be summed up by the following: the simplest approach to understanding nature should be considered before contemplating a more complicated line of reasoning. In a famous example, it is more probable that planets,
- [A Look Inside Rebreather Scrubber Canisters, Part 1](https://johnclarkeonline.com/2011/10/06/a-look-inside-rebreather-scrubber-canisters-part-1/) - If you're diving a rebreather (closed-circuit breathing apparatus to be exact), then you know the scrubber removes carbon dioxide from your recirculated breath. Without the scrubber working, you'd go unconscious from carbon dioxide intoxication within a very few minutes of starting the dive. But do you really know what's going on inside that scrubber canister?
- [A Look Inside Rebreather Scrubber Canisters, Part 2](https://johnclarkeonline.com/2011/10/10/a-look-inside-rebreather-scrubber-canisters-part-2/) - Computer modeling allows you to see things that are invisible in real life. The previous posting showed the complex thermal profiles generated in a rebreather canister found in closed-circuit underwater breathing apparatus during the CO2 absorption process. But heat generation is just part of the absorption process. Simulation allows you to see how the end
- [Cold Water Scuba Regulator Testing — U.S. Navy vs. EN 250](https://johnclarkeonline.com/2012/08/02/cold-water-scuba-regulator-testing-u-s-navy-vs-en-250/) - When scuba diving under 3-m thick polar ice with no easy access to the surface, the last thing you want to worry about is a failure of your scuba regulator, the system that provides air on demand from the aluminum or steel bottle on your back. However, cold water regulators do fail occasionally by free-flowing,
- [Margin of Safety](https://johnclarkeonline.com/2012/07/25/margin-of-safety/) - A diver's breathing equipment, helmet, gas bottle, umbilicals and buoyancy compensator lie stretched out on the grey concrete floor. The diving gear has a look of sadness about it. Perhaps that equipment will tell a story of why its owner is dead, but usually it does not. In another part of the world the NTSB catalogs
- [The Lady Captain for Delta Airlines](https://johnclarkeonline.com/2012/07/01/the-lady-captain-for-delta-airlines/) - Some people command your attention, without effort or intention on their part. For the few seconds that it took for her to walk past me, the lady pilot was one of those people. She was an attractive blond, and tall, and her posture in no way diminished her height. She walked with poise and purpose,
- [Furry Aviators – Bats](https://johnclarkeonline.com/2012/06/24/furry-aviators-–-bats/) - Not every animal that flies is an aviator. June bugs and mosquitoes fly without any particular destination in mind; they just seem to flit around, hoping to detect a random meal. In my way of thinking, to be called an aviator you have to navigate, to use the air as a travel medium with a destination
- [Embarrased by My Too-Smart Phone](https://johnclarkeonline.com/2012/05/02/embarrased-by-my-too-smart-phone/) - Some government meetings require cell phones to be left outside the conference room. We are told it is for security reasons, but I'm convinced it is for our own safety. Smart phones are becoming too darned smart, and any machine that is smarter than its user is dangerous. Case in point: I recently attended a
- [The Littlest Aviators: Monarch Butterflies](https://johnclarkeonline.com/2012/06/17/the-littlest-aviators-monarch-butterflies/) - Every fall I look forward to the current of Monarch Butterflies coursing their way across our local roads and beaches in Panama City Beach, FL, searching for one last refueling stop before heading out across the Gulf of Mexico to overseas destinations. They know where they are going en masse, so casually it seems, not in the
- [The Mysterious Physical Attraction of Slash Pine Seeds to ... Anything](https://johnclarkeonline.com/2011/10/19/the-mysterious-physical-attraction-of-slash-pine-seeds-to-anything/) - Pine cones are falling from the sky and smacking the roof with a thud, with all the earnestness of a piece of reentering space debris. The sound reverberates among the rafters, giving the impression of a large falling limb, sending us scurrying outside searching for damage to the roof. It is October in the Florida Pan Handle, the
- [Diving Under Antarctic Ice](https://johnclarkeonline.com/2011/04/11/diving-under-antarctic-ice/) - You are 100 feet down using scuba, with your dive light spotlighting the most exotic looking Sea Hare you’ve ever seen. It’s noon at McMurdo Station, Antarctica but it’s dark at your depth because between you and the surface of the Ross Sea lies19 feet of snow-covered ice. Your dive buddy has drifted about 100
- [Polar Bear in Town](https://johnclarkeonline.com/2011/04/12/polar-bear-in-town/) - In some places, the food chain gets down-right personal. In the high Arctic, a careless human is not a top predator; he is a meal. Polar Bears are methodical hunters, showing no fear of humans. When hungry, they are white death on paws. In 2007 the U.S. Navy and I were helping the Smithsonian Institution Scientific Diving
- [The Puerto Rico Trench and Denizens of the Deep](https://johnclarkeonline.com/2011/06/12/the-puerto-rico-trench-and-denizens-of-the-deep/) - The Puerto Rico Trench is the deepest part of the Atlantic Ocean, and is only surpassed in its depth by the Marianas Trench in the Pacific Ocean. It is 500 miles long, and at its deepest plummets 28,232 feet down. After receiving my doctorate with a special interest in deep-sea physiology, I was invited on board the oceanographic Research
- [Scalloping - What If the Tide Turned?](https://johnclarkeonline.com/2011/08/02/scalloping-what-if-the-tide-turned/) - It’s scallop season in the fertile waters of the Florida Panhandle. Almost completely surrounded by a peninsula called Cape San Blas sits a shallow body of clear water and sandy bottom that is an ideal location for bay scallops. Unfortunately for the scallops, the shallow water makes a yearly harvest of scallops by boaters and waders almost too easy.
- [Battle of Titans: Orcas vs Gray Whales](https://johnclarkeonline.com/2011/08/28/battle-of-titans-orcas-vs-gray-whales/) - It is an ageless story, mothers banding together to protect their young from instinctive killers. The fact that it was a battle between behemoth Gray Whales and Killer Whales (Orcas) made it all the more epic in scope, and worthy of the telling. A fellow scientist and I had driven south early one springtime morning from
- [A Frog Drowned in My Pool](https://johnclarkeonline.com/2011/09/17/a-frog-drowned-in-my-pool/) - The little fellow was fast, and wily. I was chasing him around the pool with a skimmer net, trying to herd him to the side of the pool where I had some chance of scooping him up with my hands. As the net approached he would kick to the eight foot deep bottom and then
- [Saving Poncho Villa](https://johnclarkeonline.com/2011/11/27/saving-poncho-villa/) - I called him Poncho Villa. He was an animal baby who stole my heart. Our time together began as I was walking past the eaves to our Florida home and I heard an unusual scratching and distinctly animal sound. It didn't sound like a rat or a squirrel, but whatever it was, it didn't seem
- [The Fashionista Mum and its New Winter Colors](https://johnclarkeonline.com/2011/12/25/the-fashionista-mum-and-its-new-winter-coat/) - This Christmas there is a fashion war going on in my front yard. It is a war of colors. The harsh grays and whites of winter are invariably followed by a vernal bloom of pastel colors which ease our eyes away from bleakness, preparing us slowly for the cacophony of intense color we know as
- [On the Road with 50 cc's and a Handful of Angels](https://johnclarkeonline.com/2012/06/05/on-the-road-with-50-ccs-and-a-handful-of-angels/) - I began the trip with the following adage firmly in my mind: "It's easier to get forgiveness than permission." Admittedly, at the time that apocryphal quote might not yet have been uttered, but I was nevertheless well familiar with the principle. The trip was an end-of-the-school year ride from downtown Atlanta to Prairie Village, Kansas on a
- [Going to HEVVN](https://johnclarkeonline.com/2012/05/26/going-to-hevvn/) - I know where HEVVN is. I have coordinates for it. I’m serious. “HEVVN” is the politically correct, government approved spelling for a place pronounced, as you might expect, “Heaven”. I've been there, and I could go again today if I wanted. But since I’m still a living, breathing person I can’t stay there. It should
- [To Eat a Mermaid](https://johnclarkeonline.com/2012/04/21/to-eat-a-mermaid/) - A three-year old was tasked by her father to gather foodstuffs from the sea and bring them to the kitchen for cooking. She never left the house, but was expected to find items around the house representing sea food. And the cooking was to be "pretend" cooking. Her first scavenged item was a plush toy crab.
- [Dictation Software - Not for Kids](https://johnclarkeonline.com/2012/03/25/dictation-software-not-for-kids/) - We have a new game at our house. It's called, "See What Dragon Speaking Does with the Diction of a Four-Year-Old." It's endlessly entertaining. It's my son's doing, really. I was complaining about how unhealthy it was sitting at a keyboard for seemingly endless hours writing, rather than getting up and moving around. I was
- [How Long Will Your Rebreather Scrubber Canister Last?](https://johnclarkeonline.com/2012/03/05/how-long-will-your-rebreather-scrubber-canister-last/) - Are you a child of Lake Wobegon, where according to Garrison Keillor "all the women are strong, all the men are good looking, and all of the children are above average?" If you are, you may be headed for trouble with your rebreather scrubber canister. Or expressed another way, do you know how long your scrubber
- [Space Wars](https://johnclarkeonline.com/2012/03/01/space-wars/) - I had a dream, and it troubles me. I had a dream a couple of weeks ago and awoke knowing I had seen something very disturbing, but couldn't remember what it was. Then on February 21st I had a lucid dream where I realized that what I was seeing was what I'd seen the previous week.
- [A Flight to DeFuniak Springs](https://johnclarkeonline.com/2012/02/28/a-flight-to-defuniak-springs/) - Affordable, high definition cameras are opening up a world of sporting video to those who can't compete with the pros. For aviators, we get to share our passion, the beauty of flight! I recently borrowed a GoPro camera and gave it a try. The flight in the Piper Arrow was short, 29 nm, from the
- [I See Dead People – Sort Of](https://johnclarkeonline.com/2012/02/27/i-see-dead-people-–-sort-of/) - The young man in a swimming suit was lying lifeless at the bottom of a fissure on the floor of Morrison Springs, a popular underwater cave in Walton County, Florida. If his eyes had been open, he would have been staring straight up at me. But mercifully, his eyes were shut, as in sleep. My diving
- [How Much is Too Much? (Carbon Dioxide - The Diver's Nemesis)](https://johnclarkeonline.com/2012/02/07/how-much-is-too-much-carbon-dioxide-the-divers-nemesis/) - The amount of carbon dioxide (CO2) that can be safely inhaled by rebreather divers is a continuing point of conjecture, and vigorous argument. Unfortunately, the U.S. Navy Experimental Diving Unit has confused that issue, until recently. A non-diver might wonder why a diver should inhale any CO2. After all, the air we breathe contains only a small fraction
- [The Green Flash and Inspiration](https://johnclarkeonline.com/2012/01/14/the-green-flash-and-inspiration/) - Some say it is serendipity. In reality, maybe it is just the human ability to increase awareness once your attention has been attracted. For example, you're thinking about buying a black Subaru when you suddenly notice how many black Subarus are on the road. I had been thinking of late about the Green Flash, a rare
- [Google Noodling and other Technological Pleasures](https://johnclarkeonline.com/2012/01/20/google-noodling/) - I am easily bored. Fortunately, I'm also easily entertained. In fact I have no trouble at all entertaining myself, especially if it's at the expense of new technology. Especially if the technology has big names attached to it like Facebook and Google. Now don't misunderstand me. I love and use both Facebook and Google, a
- [Knock Yourself Out (Carbon Dioxide – The Diver’s Nemesis) ](https://johnclarkeonline.com/2012/01/23/knock-yourself-out-carbon-dioxide-–-the-diver’s-nemesis/) - Most rebreather divers start off their diving career with open-circuit diving; that is, with scuba. And some of them pick up bad habits. I happen to be one of those divers. With scuba you start the dive with a very limited amount of air in your scuba bottle. New divers are typically anxious, breathe harder than
- [Killer Optical Illusions — Size Does Matter](https://johnclarkeonline.com/2012/01/01/killer-optical-illusions-—size-does-matter/) - A discrepancy between what you see and what you expect to see can prove fatal. In graduate school at Florida State University I drove a motorcycle between Tallahassee, FL and my home in Thomasville, GA almost every day of the week, an 80-mile roundtrip. I seldom took the heavily traveled direct route. One alternative route took
- [Six-Degrees of Freedom](https://johnclarkeonline.com/2011/12/18/six-degrees-of-freedom/) - I've had an epiphany of sorts. I was flying with friends as night was falling. We were over a mile up, the air was clear and still, not a bump to be found. City lights and major roads could be seen from over 45 miles away. We seemed to be suspended in space, with only the movement
- [Red Star Over Jacksonville](https://johnclarkeonline.com/2011/12/03/red-star-over-jacksonville/) - Chinese aircraft are invading — sort of. Russian made YAKS and the Chinese variant, the Nanchang CJ-6, are growing in popularity for U.S. pilots on a budget who want to own a former military aircraft, a "war bird". The CJ-6 was built in China as a piston aircraft trainer. It has a radial engine, which of
- [Diving with Hydrogen – It’s a Gas](https://johnclarkeonline.com/2011/11/15/diving-with-hydrogen-–-it’s-a-gas/) - When most people think of hydrogen, they think of the fuel that stars burn in their nuclear fires, the hydrogen bomb, or the Hindenburg disaster. Hydrogen is known for its combustibility and explosiveness. Not many people would think of diving underwater with it. Technical divers breathe various gas blends, using mixtures of nitrogen, oxygen and even helium.
- [Diving Accident Investigation](https://johnclarkeonline.com/2011/09/30/diving-accident-investigation/) - Compared to aircraft accident investigations, diving accident investigations are often ad hoc in nature, poorly conceived and poorly funded. Nevertheless, these investigations are just as important for the safety of the diving public as are similar investigations for the flying public. Unfortunately, no national regulations presently address how investigations of diving accidents should be conducted: volunteer investigators
- [What I Would Miss on Mars](https://johnclarkeonline.com/2011/11/10/what-i-would-miss-on-mars/) - When I first saw images from NASA's various Mars rovers, I was almost crawling out of my skin with excitement. As I spoke at a NASA sponsored conference where scientists and engineers were discussing plans for a Mars mission and colonization, I was enthralled with the thought that humans are actually planning for mankind to leave our planet
- [Computer Simulation as Art — or Rorschach Test](https://johnclarkeonline.com/2011/10/28/computer-simulation-as-art-—-or-rorschach-test/) - No one has ever confused me for an artist. I might have been visually gifted as a 3rd-grader, as my parents told it, at least compared to my peers. However, I never seemed to progress beyond that point. I think my progress slowed about the time I saw my first Rorschach test. I realized then
- [I Dreamed about Flying Last Night](https://johnclarkeonline.com/2011/10/12/i-dreamed-about-flying-last-night/) - I rarely dream about flying, but I did last night. I seem to have a propensity for thinking about flying. I've written about flying hybrids, as in James Patterson's Maximum Ride series about a flock of flying kids, which is, as I've said before, "some of the most interesting reading a bird man (aka aviator, pilot)
- [Another Rebreather Scrubber Thermokinetic Simulation](https://johnclarkeonline.com/2011/10/20/another-rebreather-scrubber-thermokinetic-simulation/) - Compared to the previously posted video of a segment of a rebreather scrubber, this video shows a much larger, and therefore more realistic scrubber with axially aligned, CO2 rich gas flow passing from left to right. Due to the larger size of the simulation space, more widely distributed heat patterns are noticeable, as are fluctuations in heat. The
- [If Whales Could Fly](https://johnclarkeonline.com/2011/09/02/if-whales-could-fly/) - When Ottorini Respighi wrote his symphonic poem Pines of Rome, he was not imagining flying whales. Instead, the last movement of his work invokes the imagery of a Roman Legion marching along the Via Appia Antica. When I would listen to the drumming and droning of the orchestra I never imagined whales flying either, at least prior to the year 2000.
- [On the Odds of Being Struck by Falling Satellites](https://johnclarkeonline.com/2011/09/21/on-the-odds-of-being-struck-by-falling-satellites-2/) - NASA says the odds that someone will be struck by falling space debris when the bus-sized NASA Upper Atmosphere Research Satellite comes down this week is 1 in 3200. Which got me to thinking … if I was struck while out walking Friday night, would I be unusually lucky because I beat the odds, or unlucky
- [Searching for Native American Roots](https://johnclarkeonline.com/2011/07/09/searching-for-native-american-roots/) - A few years ago I sat next to a half Native American woman at a family Thanksgiving dinner. Among our conversation topics was reincarnation; she believed in it, strongly. That interested me enough to do a little research, whereupon I discovered a book called “Amerindian Rebirth: Reincarnation Belief Among North American Indians and Inuit.” It was
- [Divers In Space](https://johnclarkeonline.com/2011/08/07/divers-in-space/) - Signs of flowing water have been found on Mars. http://www.nytimes.com/2011/08/05/science/space/05mars.html?_r=1 That of course makes Mars even more tantalizing than it is already. Now Mars has been added to a growing list of bodies in our solar system that are believed to have water, and in some cases entire oceans. Let me be so bold as
- [Going Nowhere Fast - Military Aviation Centrifuges](https://johnclarkeonline.com/2011/08/19/going-nowhere-fast-military-aviation-centrifuges/) - I was securely strapped into one of the world's largest human centrifuges at the Naval Air Development Center (NADC) Warminster, Pennsylvania, jocked-down like a pilot in a high performance fighter. As the gondola started moving, I felt the pneumatic cushions in my G-suit inflate, squeezing my legs and abdomen, helping to prevent blood from pooling. Excess pooling
- [Yea, Though I Fly Through the Valley of Death...](https://johnclarkeonline.com/2011/09/13/yea-though-i-fly-through-the-valley-of-death/) - It is true; sometimes it is better to be lucky than good. At a time before virtually all light aircraft had GPS navigation and on-board weather, an instrument-rated pilot would spend lots of time studying the printed station weather reports and forecasts across his route of flight, and then, if things looked reasonably good, pilots would launch
- [Me and My Arrow](https://johnclarkeonline.com/2011/04/26/me-and-my-arrow/) - 1971 Piper Arrow 200 OK, I admit it. I’m in love with an inanimate object. But if you could see her, you’d understand. In fact you might feel the same way. Sometimes I even wonder, if she really is inanimate? So what if she’s forty years old. So what if she’s high maintenance? So what
- [My Top Three Diving Sites: Herod's Port, Caesarea](https://johnclarkeonline.com/2011/04/26/my-top-three-diving-sites-herods-port-caesarea/) - Visibility was lousy that day, which made the dive just that much more exciting. I and some U.S. Navy SEALS were cruising in shallow water searching for antiquities, when out of the gloom appeared, fuzzy at first, and then with startling clarity, a fluted Roman column lying on its side. The effect was stunning. We
- [My Top Three Diving Sites: The Red Sea Pt. 2](https://johnclarkeonline.com/2011/04/23/my-top-three-diving-sites-the-red-sea-pt-2/) - I was one little inch away from BIG trouble. Twenty kilometers north of Sharm el-Sheik are four current-swept reefs that attract Red Sea divers and bountiful sea-life alike. We left for the dive site from Ras Nasrani, heading for Thomas Reef, in the middle of the current-swept Straits of Tiran. Thomas Reef is the smallest but most popular reef
- [My Top Three Diving Sites: The Red Sea, Sharm el-Sheik](https://johnclarkeonline.com/2011/04/20/my-top-three-diving-sites-the-red-sea-sharm-el-sheikh/) - I’ve read a couple of books lately where the author, critically injured in an accident, experiences what seems to be a visit to heaven, followed by a swift return to Earth. The most recent such book was Flight to Heaven, by CAPT Dale Black, a plane crash survivor. A common theme in these books is
- [My Top Three Diving Sites: The Great Barrier Reef, Australia](https://johnclarkeonline.com/2011/04/19/my-top-three-diving-sites-great-barrier-reef-australia/) - My Navy travels have afforded me the privilege of diving in some of the most interesting places. In this, and the next couple of posts, I list my top three diving destinations. I've been diving on the Australia's Great Barrier Reef on two occasions, both times departing for the reef from Cairns, pronounced like the first
- [McMurdo Station, Antarctica: A Research Town](https://johnclarkeonline.com/2011/05/26/in-defense-of-jello-wrestling-in-antarctica/) - A photo of Jello Wrestling among fully clothed adults was published today as an indictment of the National Science Foundation (NSF) and its off-duty recreation program for McMurdo Station, Antarctica. Since I've spent a little time at McMurdo Station, I'd like to come to the defense of the NSF - by doing nothing more than describing what life
- [Tex Ritter and Recovered Songs of Youth](https://johnclarkeonline.com/2011/05/17/tex-ritter-and-recovered-songs-of-youth/) - It was a day of contrasts when I discovered that my vinyl 45 rpm records saved since my childhood were inexplicably lost. Imagine my joy, however, when a few hours later I discovered that the much beloved songs of that era were available for downloading from the internet! I'm dating myself of course, but songs from Tex Ritter, the singing cowboy, were
- [The Day I Raced in the Atlanta 500 — Sort Of](https://johnclarkeonline.com/2011/05/30/the-day-i-raced-in-the-atlanta-500-—-sort-of/) - On race day during my freshman year at Georgia Tech, a pilot friend of mine offered to take me flying if I helped pay for gas. He rented a Cessna 150 at the Fulton County Airport not far from downtown Atlanta. I had time in a Cessna 140, a tail dragger version of the 150,
- [Those Doctors Are Trying to Kill Me!](https://johnclarkeonline.com/2011/05/31/those-doctors-are-trying-to-kill-me/) - Be careful what you say before going under anesthesia. I had reached the age when my internist required me to get a colonoscopy, and I was not looking forward to it. I got gowned up in one of ridiculous back open gowns, for obvious reasons, but had a darkly funny thought when the nurse attached
- [You're Not a Mad Dog - So You Must Be an Englishman](https://johnclarkeonline.com/2011/06/29/youre-not-a-mad-dog-so-you-must-be-an-englishman-2/) - Having made several transits from the South to the North, and back again, I've become fascinated with the response of people when taken out of their natural element. For instance, my nativity and early childhood were spent in the American South, Arkansas and Texas. When my Dad's work forced a move to Kansas City, I found that
- [ Ecstacy in Flight](https://johnclarkeonline.com/2011/06/26/ecstacy-in-flight/) - There are times when flying family members and myself, medical patients, or colleagues from work, that an aircraft is little more than conveniently fast transportation; a time machine. Then there are other times, like this weekend, when flying is almost a religious experience. Friday night I flew to an east coast city to pick up my aviator
- [My Pathway to Writing - Learning from Max McCoy's "The Moon Pool"](https://johnclarkeonline.com/2011/06/10/my-pathway-to-writing-learning-from-max-mccoys-the-moon-pool/) - This is not some random book review. I have a personal investment in Max McCoy's underwater thriller, and to be honest, Max is a friend and mentor. As the Scientific Director and Senior Scientist of the Navy Experimental Diving Unit (NEDU), I get some unusual calls from time to time. One of the most memorable was from
- [Where Big Jets Go to Die](https://johnclarkeonline.com/2011/06/08/where-big-jets-go-to-die/) - It's a combination of Elephant Graveyard and Hotel California, this airport in Nortwestern Mississippi, not far from the Mississippi River. Big jets fly into the small town airport, but never leave. I stumbled across the curious goings on at the Greenwood LeFlore Airport during a refueling stop on my way to the Ozark Mountains in Arkansas.
- [Not What I Had in Mind for Valentines](https://johnclarkeonline.com/2011/05/22/not-what-i-had-in-mind-for-valentines/) - Photo taken by Pax River Naval Airstation Photography Department. Click for larger image. Did some pilot take the word "Landing" in Landing Craft, just a little too seriously? Well, not exactly. But the story behind this photo made it into Flying Magazine, as you see below in the "Ship to shore" piece. Now here's the rest of the
- [Why I Worry about Zombie Ants and Mind-Controlling Fungus](https://johnclarkeonline.com/2011/05/12/why-i-worry-about-zombie-ants-and-mind-controlling-fungus/) - I will never look at a mushroom the same way again. The April National Geographic has a new piece about Zombie ants, ants whose minds are controlled by a fungus which kills the ants in a bizarre way, at a location most suitable for the fungus. Scary. http://news.nationalgeographic.com/news/2011/05/110511-zombies-ants-fungus-infection-spores-bite-noon-animals-science/ I once wrote a Master's Thesis at Georgia Tech

## Pages

- [Home](https://johnclarkeonline.com/) - Nonfiction A new technical book for rebreather divers. Click here to learn more. An eclectic and mostly nonfictional blog is located here. Fiction A new historical fiction/romance novella in print and ebook. Historical fiction and romance collide in this novella, an account of young people during a time when the Vietnam War and its aftermath
- [Diving Articles and Presentations](https://johnclarkeonline.com/diving-links/) - What Medical Examiners Need to Know About Rebreathers Don't Dive Cold If You Don't Have to A Public Service Announcement from Divers Alert Network and the San Diego Center of Excellence in Diving. Support is provided by founding partners UC San Diego Health Sciences, UC San Diego Scripps Institution of Oceanography, OxyHeal Health Group, Divers Alert
- [Life Support Consulting](https://johnclarkeonline.com/life-support-consulting/) - Exotic Adventures Only Count if You Safely Return Clarke Life Support Consulting, (CLSC, LLC) is a consulting company based on over forty years of experience with military and civilian life support in subsea, dry land, air, and space environments. That experience has been applied to tactical life-support systems for Tier 1 operators, deep diving systems,
- [My Reviews of Other Authors' Books](https://johnclarkeonline.com/reviews-of-other-authors-books/) - RAN: A Civilization in Hiding, by Robert G. Williscroft Some science fiction writers are better at playing God than others. Robert Williscroft is a Master. A novelist must be self-assured when entering the “other worlds” science fiction genre. After all, they are required to create de novo a star, a solar system, one or more
- [Breakthrough](https://johnclarkeonline.com/breakthrough/) - Revealing the Secrets of Rebreather Scrubber Canisters More than thirty years of research, testing, and computer modeling of rebreathers in a military laboratory have been condensed into a small, approachable monograph. Breakthrough is an affordable textbook unlike any other in the technical diving genre. Clarke is a scientist and writer known for both his scientific
- [Diving Technical Papers](https://johnclarkeonline.com/diving-technical-papers/) - Breath-hold divers have only one diving outcome they strive for: the successful completion of a breath-hold dive. They're not always successful.
- [Poetry](https://johnclarkeonline.com/poetry/) - Confessions of a Story Teller I am a thief, a stealer of moments in time. I am a hoarder, clutching those moments 'til released in absolution. I am a killer; sometimes someone has to die. It's nothing personal. I am a masseur; stories improve with pressure applied here and there. (Stories are more malleable than
- [My YouTube Channel](https://johnclarkeonline.com/you-tube-channel/) - http://www.youtube.com/watch?v=4rPBhwqBYRE https://www.youtube.com/watch?v=onJ3eB0Gw9E http://www.youtube.com/watch?v=kA_r1xZ1NAs http://www.youtube.com/watch?v=wjtOycH0bQc http://www.youtube.com/watch?v=h8I1Mv6RNY8 http://www.youtube.com/watch?v=IzVl9yDShXs http://www.youtube.com/watch?v=u0M_Vuh7vsg http://www.youtube.com/watch?v=T3CdfbcWBQo http://www.youtube.com/watch?v=F7d2YXsxqQE http://www.youtube.com/watch?v=KugKGhV8X0I http://www.youtube.com/watch?v=cFXKPdzbbac
- [About](https://johnclarkeonline.com/about/) - John R. Clarke, Ph.D. I cannot remember a time when I did not write. First, it was on the wallpaper in my bedroom as a kindergartner. Red crayons were my writing instrument; red was my favorite color. Not cool. That was followed by my poetry period, stimulated by reading Dante’s Inferno and ee cummings. Not
- [Back to the Future - from a 2000 Discover Issue](https://johnclarkeonline.com/about/interview/back-to-the-future-from-a-2000-discover-issue/) - Future Tech Rebreathers are rapidly making scuba gear look like the underwater equivalent of a windup watch By Kathy A SvitilJuly 1, 2000 12:00 AM Bill Stone will never forget the day he began to make diving history by immersing himself in Wakulla Springs, a network of submerged caves in northern Florida. On the early afternoon
- [Interviews](https://johnclarkeonline.com/about/interview/) - Click on the Discover image below to reveal a year 2000 article based on an interview with Bill Stone, inventor of the Cis-Lunar rebreather, and myself. A September 2015 interview with Water Welder's e-magazine regarding Middle Waters, a Novel is available at this link. January 15, 2016 Entertainer section of the Panama City News Herald
- [Key Events](https://johnclarkeonline.com/coming-events/) - COMING EVENTS October 3-4, 2018: GILS Workshop, Gills-Inspired Life Support, Panama City, FL PAST EVENTS July 18-20, 2018. A Key speaker for International Conference for Adaptations and Nutrition in Sports (ICANS), Chonburi, Thailand, speaking on "Oxygen: Good Gas or Bad Gas in Hyperbaria? A Matter of Perspective." June 17-22, 2018: I spoke on Saturation Diving
- [Credits](https://johnclarkeonline.com/credits/) - Author photo: Holly Clarke Gardner Book Signing Banner location: The Hidden Lantern Bookstore, Rosemary Beach, FL Writer's Pen Icon: Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY
- [Around the World](https://johnclarkeonline.com/around-the-world/) - Shown are places my work with the Navy, the Smithsonian Institution, the National Science Foundation, oceanographic research programs and family travel have taken me.
- [Links](https://johnclarkeonline.com/links/) - Angel Flight Pilots donating their time and aircraft to transport patients in need. American Academy of Underwater Sciences, diving for science ECO Magazine, March 2015, "Authorized for Cold Water Service", pages 20-25. Ozark Creative Writers Workshop Smithsonian Scientific Diving Program Sponsoring diving research in the Artic and Antarctic, and around the world. Ice Diving Program Rebreather Forum
- [Contact](https://johnclarkeonline.com/contact/) - Questions or comments? Feel free to contact me via the form below. I may be found on the web at https://johnclarkeonline.com, via email at john@johnclarkeonline.com or on twitter at @johnclarke16
- [Book Reviews](https://johnclarkeonline.com/book-reviews/) - TRADE REVIEWS PUBLISHER'S WEEKLY “This SF thriller starts out well and displays some nice touches of humor … Clarke, a veteran Navy diving scientist, is especially effective in translating his expertise into fiction in the gripping opening chapter, as an unusual incident claims the lives of two divers off the coast of Alabama. Someone, or

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