How to survive being dunked into liquid nitrogen
So I thought this is kind of crazy: this science writer submerges his hand into liquid nitrogen, which is something like -320 degree Fahrenheit. His hand emerges unharmed thanks to the Leidenfrost effect, which he explains here:
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.
Sure, the science makes sense but you couldn’t pay me enough to do this. Okay, you could, but it’ll cost you 20 bucks.