This clock burns with the power of lemons. No, really. This is a digital clock that is powered by citric acid. The wood plank has two spikes of copper and zinc built into it. Put half of a lemon on each spike and be amazed at how it runs on a single lemon for an entire week. It’s magic.
Looking for an ideal project for your school’s next science fair? This is one that will surely have you taking home first prize. It’s not available for purchase but you could always make one. That’s what science fairs are all about.