[TheBORG] writes "There are two stories on Yahoo! News about regrowing lost body parts. One is about regrowing lost fingers & limbs and the other one is about regrowing teeth. The story about regrowing lost fingers and limbs talks about the experimental use of powdered pig bladder to regrow fingers and eventually lost limbs for soldiers and others in need from information that Pentagon-funded scientists hopefully learn from studying the salamander. The story about regrowing teeth talks about how Japanese scientists used primitive cells (not quite as early as stem cells) and injected them into a framework of collagen (the material that holds the body together). Once grown to a certain point, scientists implanted the growths into mice where the teeth developed normally."