Protected By Science My hand is like a red-hot poker to the liquid nitrogen, but an insulating layer of nitrogen gas forms- a phenomenon known as the Leiden-frost effect- keeping my hand safe and warm for a fraction of a second. Mike Walker
When I first saw this photograph of a man’s hand submerged in liquid nitrogen at somewhere below -320° F, my immediate thought was, “That guy must be crazy! One second in that stuff, and you’re shopping for new skin!” My shock was tempered only slightly by the fact that it was my hand, and we’d taken the picture just a minute earlier.
I hadn’t realized that my hand was quite so deep into the liquid. Amazingly, I barely felt the cold at all. My skin didn’t get hurt for the same reason that water droplets dance on a hot skillet. An insulating layer of steam forms almost instantly between the water and the metal, keeping the droplets relatively cool as they float for several seconds without actually touching the hot surface. To liquid nitrogen, flesh is like that skillet—a surface hundreds of degrees above its boiling point. So the moment my hand touched the liquid, it created a protective layer of evaporated nitrogen gas, just as the skillet created a layer of steam. That gave me just enough time to put my hand in and pull it out again. Any longer than that, and frostbite would have set in.
Hot Water: Droplets on a very hot skillet take longer to evaporate than they would on a less-hot surface where no insulating gas layer forms. Mike Walker
The phenomenon is called the Leidenfrost effect (after Johann Gottlob Leidenfrost, the doctor who first studied it in 1756). I’d known about it for years, but when it came time to test it in real life, I have to admit that I used my left hand, the one I’d miss less.
I drew the line at another classic example of the effect. According to the books, it’s possible to stick a damp finger directly into molten lead without getting burned, if you do it fast enough. After some consideration, and remembering the times I’ve been burned by molten lead, I decided that it probably wouldn’t make a very good picture anyway.
ACHTUNG! Do not try this. If liquid nitrogen soaks into your clothes, you will not be protected by the Leidenfrost effect, and you can get frostbite very quickly.
Virginia TV Shooter Said, "Jehovah Spoke To Me That I Should Take Action" 2015-08-28 2:36
What causes a guy to go off the plantation enough so that he would murder in cold blood, two of his former colleagues? Guesses are abounding, such as racial tension, mental illness, psychotropic prescription drugs, narcissism, etc. What about the angle of how a destructive religious cult shaped him in his formative years, so that later in life, he would ...
Invasion into Macedonia from Greece - Border Mayhem 2015-08-28 2:06
Description from video page: These are the desperate scenes at Greeceâ€™s border with FYR Macedonia as overwhelmed security forces made sporadic attempts to stem the flow of invaders heading northwards.
Riot police set off stun grenades and hit invaders with batons but that did little to stop them passing into FYR Macedonia.
Skopje had declared a state of emergency on Thursday (August ...
RamZPaul: TV Reporter Murdered Live On Air 2015-08-28 1:48
Youtube description: The gunman responsible for the live on air shooting of reporter Alison Parker and cameraman Adam Ward said part of his motivation for the attack was Parker making “racist comments.”
Vid that killer made:
(note the actual shooting vid is being censored fast)
Jesse Benn advocating "White Wounding: just weeks ago:huffingtonpost.com
White House Pushes Race War, Then Blames Guns For Flanagan's "Race War" 2015-08-27 5:04 "You want a race war (expletive)?" Asked shooter
The Obama administration is blaming guns for the WBDJ-TV shooting, even though the shooter, Vester Flanagan, was influenced by the White House’s race baiting.
The White House has been falsely insinuating that racism is the dominant factor behind numerous events over the past several years, even those that didn’t involve race at all, and ...
How Google Destroyed the Internet 2015-08-27 5:12
The internet was created to resolve a simple problem: in communications networks, any central node through which all messages passed was vulnerable to attack or takeover. To counter this, engineers designed a network where any node would pass messages to other nodes, routing around any damage.
Then came commerce and the democratization of the internet.
Under this model, frightened sheep flock to ...