A Government Program Wanted to Make the Perfect Artificial Heart—With Radioactive Decay

The idea of putting a decaying radioactive isotope inside your chest might make you a little uneasy—and rightly so. But in 1967, the National Heart Institute and the Atomic Energy Agency set out to make it happen in the form of a plutonium-238-powered atomic heart. Think Tony Stark with nuclear waste in his chest. »3/22/13 2:00pm3/22/13 2:00pm