More than 500 Israeli soldiers have survived serious injuries fighting in Gaza, according to the military, thanks largely to lessons learned and advances in medicine.

Even years after an arm is amputated, the brain maintains a detailed map of the limb and tries to interact with this phantom appendage.

Medical amputation isn't a uniquely human form of medicine, it turns out. Some ant species will cut off the limbs of injured buddies when it's necessary to save them.