Liquid nitrogen evaporates, and can cause violent oxidation of organic material. Ingestion of liquid nitrogen can cause severe internal damage, due to freezing of the tissues which come in contact with it and to the volume of gaseous nitrogen evolved as the liquid is warmed by body heat. In 1997, a physics student demonstrating the Leidenfrost effect by holding liquid nitrogen in his mouth accidentally swallowed the substance, resulting in near-fatal injuries. This was apparently the first case in medical literature of liquid nitrogen ingestion. In 2012, a young woman in England had her stomach removed after ingesting a cocktail made with
Steve's Ice Cream the Heath Bar candy bar by a friend in the late 1960s and felt it would make an excellent addition to ice cream. When he opened his first store, instead of having pre-mixed flavors like chocolate chip, he had his staff mix freshly made ice cream with candy or other confections based upon customer requests. These candy additions were called "mix-ins", and the custom-blended flavors proved to be highly desired by the customer. Steve sold out of ice cream on his first day, and the store became very popular in a short time. The prices in 1975 were $.35 and