Citrus Clock Powered by Lemons
I love lemon a lot. I also love this Citrus Clock it will tell you what time it is. Cool! This clock runs on the energy of a lemon, which makes it possible to power it for a week or longer.
This pedagogic project is a kind of shortcut intended to remind ourselves that nature, in spite of the various transformations to which we subject her, is still our direct energy source. The somewhat magical dimension of the operation is in fact simple electrolysis, like a conventional electric battery. [via..]
