we use liquid nitrogen here as part of a process to leak check rocket thrusters and fuel nozzels, my first experience with it came when I was sevicing one of the big millers, I had just rebuilt the hydraulic pump and motor, one of the "lab boys" put some in a glass beaker and tossed the liqid from behind... I thought the whole thing was going up in smoke!
I'll still eat sushi, the first tuna I get every year gets a portion consumed on board! this stuff doesmnt bother me, I was a farmer as a child, if most people saw what i saw.... theyd go hungry!
Good info on the sqirmy things BTW!