This bendable, leather-and-wood big toe could be the earliest prosthetic. The worn specimen was found on the foot of a 2,400-year-old female Egyptian mummy whose toe had been amputated. Scientists at the University of Manchester in England will test models of this toe, and a similar Egyptian falsie, on modern-day volunteers who've lost their big toes. If experiments demonstrate its utility, it will become the oldest known prosthetic, kicking aside an Italian fake leg from 300 B.C.