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
Ice cream float Ice cream float An ice cream float or ice cream soda (United States, United Kingdom, Canada, South Africa and East Asia), coke float (United Kingdom and Southeast Asia), or spider (Australia and New Zealand), is a chilled beverage that consists of ice cream in either a soft drink or in a mixture of flavored syrup and carbonated water. When root beer and ice cream are used together to make the beverage, it is typically referred to as a root beer float (United States and Canada). The ice cream float was invented by Robert McCay Green in Philadelphia, Pennsylvania, in 1874