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 sandwich shape). The original ice cream sandwich was commonly known as a "cream between". One purchased a small block of ice cream wrapped in paper and placed it between two wafers. The classic Iranian ice cream sandwich is called بستنی نانی means bread-ice cream, and is made with Iranian traditional ice cream in two pieces of wafer. Iranian traditional ice cream usually is made of shaken milk, eggs, sugar, saffron, sa'lab, rose water, or vanilla. In North America, an ice cream sandwich is a slice of ice cream, usually vanilla although other flavors can be used, sandwiched between two rectangular cookie