Water is awesome. It’s a refreshing beverage, a hangover cure, cleanser, and now it can power your calculators. The Water Powered Calculator has 3 water powered batteries. Each battery has a pair of electrodes made of a special alloy that produces electricity through a chemical reaction. The water will last you 2-3 months before evaporating and then you simply refill the cartridge with more water. It’s free energy! The clear plastic shell of this calculator lets you see what’s happening inside. Read more [...]