If you know a geek that is living green then they will love this Water Powered Calculator.  This calculator will make any tree hugger happy, not only can they power their green gadget with water, they can also use beer.  This calculator does not qualify as heavy machinery so it is alright to operate under the influence.  Drink beer and solve some math problems!  We should all live by a quote from one of the world's finest beer connoisseurs, Homer Simpson.  "Here's to alcohol, the cause of, and solution to all life's problems.