frogs and salamanders can regrow limbs and so should we. check out this video. DARPA is spearheading a research project named ReGenesis to try to achieve this to help those from the military who have lost a leg or arm re-entering civilian life. LA Times wrote a really entertaining story that weaves in a bit of history of limb regeneration research so far. looks like in just 10 years, we will have a pill for growing a body part.