Jonah Salk gave away the Polio vaccine. If he invented underwear that protected people from evil he would have shared it with the world. Why didn't the Morman Church donate Magic Long Johns to our Troops?
Could you survive with just half of your organs? Think about it. What if you had just half your brain, one kidney, half of your heart, one lung, half a liver and only half of your skin? It would be pretty hard to survive right? Sure, you could survive losing just one kidney or half of your liver, but at some point, losing pieces from all of your organs would be too much and you would die.