Whiz Kids

Dr. Joe sent me this link this morning:

Credit card sized Urine powered Battery

Researchers in Singapore have developed a credit card sized urine powered battery. The battery is made of a layer of filter paper steeped in copper chloride sandwiched between strips of magnesium and copper, then laminated in plastic. When a drop of urine is placed on the plastic, the urine soaks through the paper providing the necessary conditions to generate electricity. The magnesium acts as the battery's anode, shedding its electrons, while the copper chloride acts as the cathode, gathering them up. A drop of urine generate 1.5 volts of power equivalent of a AA battery. The energy generated by the battery keeps a digital wristwatch or a scientific calculator going.

I can think of no resource more renewable...