Here is a system that relies on paper cards, teflon tape, and a pencil to generate 3 volts of power. As EPFL explains, this is an eco-friendly way to produce the same current as 2 AAA batteries. You can use something like this to power a small display and other tiny gadgets.
More gadgets like this: here
Using cardboard, tape and a pencil to produce energy
Watch the above video to get a better idea how this system works.
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