Water Clock!

Do clocks need batteries or electricity? Not this one! The clock you build with this science kit will run on water, ketchup, toothpaste, lemons, even cola! That's right, you don't need batteries to make a clock that can work on something as simple as tap water! Try other materials and see how the clock never stops. It's the best timekeeper you will ever have. Not only will you build a cool clock, but you'll learn what makes it 'tick' as well! A fun science educational toy for future scientists of all ages!