I was watching the Discovery Channel and a segment about the Seiko Kinetic Watch came up. I was surprised to find out that this watch is powered by the movement of the human arm! Isn't that something? No need for a battery or winding, they said that essentially a baby can have this watch and it will continue working as long as they live. The only thing is that the watch can *never* be opened otherwise it will stop working this is why the watch goes through rigorous testing to ensure that it's sealed.