Japan's inventors have a knack for taking the mundane and making it surreal. Case in point: batteries. While unimaginative American consumers probably don't think much about their standard AA and AAA batteries, someone overseas had the creativity to create rechargeable ones -- powered by urine. The imported NoPoPo Eco Water-powered batteries cost about $57 for a six-pack. Actually, urine is just one of the liquids -- including plain old boring water, as well as beer or blood -- that can carefully fill these rechargeable batteries using an eyedropper.