Hazards of cryogenic liquids include fire (in the case of flammable or oxidizing materials), pressure buildup, explosion, as well as severe frostbite (on contact with skin) and asphyxiation (due to ...

Sub Zero Liquid Nitrogen Ice Cream started in 2004. Nearly a decade later, founders Jerry and Naomi Hancock pitched the business on a 2013 episode of ABC's "Shark Tank." While the show's "shark ...