Scientists turn sweat into electricity with a temporary tattoo

Anyone remember The Matrix trilogy? http://o.aolcdn.com/hss/storage/midas/4b084146c9c78b9e72278d6ba565a8a3/200576094/sweattat.jpg Well, after all we are walking batteries so, what if we could harvest some of that to power tiny gadgets? In a way it sounds like a kind...