I was looking on ThinkGeek’s (www.thinkgeek.com) website to spend some hard earned money on a new geek toy. I came across this calculator that is powered by water. “cap full of water in the H2O battery can power the calculator for up to 3 months” - http://www.thinkgeek.com/clearance/7c17/ The item is on clearance, but what a cool idea. I know that I have often been looking for a calculator, then found one (often from my high school days) that has dead batteries. I just love ThinkGeek, they often have the weirdest things that is just plain cool. They also have a water powered clock or the water powered multifunction alarm clock, both items are not on clearance. (http://www.thinkgeek.com/homeoffice/lights/757e/ and http://www.thinkgeek.com/homeoffice/lights/7c0f/)
Check out the ThinkGeek website to service your “geekly” needs.