Instructables user, and TreeHugger favorite, ASCAS has created another great clean energy project that is simple to make and super useful too. Here’s what he had to say about the water powered flashlight: 
“The flashlight runs 30 minutes continuously with tap water and 2 hours with saltwater. Not bad for a single celled prototype. This thing also works well with calculators, clocks & radios. Remember, adding a second cell triples the glow and lighting time! Read more
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