Memory Foam is a heat sensitive, visco-elastic polyurethane foam originally developed in the 1970's by a Swedish company (Tempur-Pedic®) for NASA. NASA was interested in this "memory foam" because of its ability to distribute pressure across an entire surface. This eases the extreme G-forces that astronauts experience during take-off and landing. Memory foam was later repurposed to be used in medical applications, especially ...