If you want to get your kids outside of the house and playing around in the mud while learning about the power of nature then you should definately have a look at this MudWatt Microbial Fuel Cell Kit.
Simply fill the kit with soil from your backyard along with anything you find in your refrigerator and (within days) the attached LED light will start to blink using only the power produced by the electricity-generating microbes in your soil. Very cool, kids will get a real kick out of playing with this gift and it's a great way to educate them in microbiology, soil chemistry, electrochemistry, and electrical engineering. Baby steps ofcourse!
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