How to make a mini battery (piezo-electric effect) I presume with cardboard, a pencil and some son:
https://www.youtube.com/watch?v=LHcRJ3SyZeU
After you need a good help too
A pile (piezo?) With cardboard, pencil and scotch
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Re: A stack (piezo?) With cardboard, pencil and scotch
Sciences et Avenir talks about it, with a little more technical explanation: http://www.sciencesetavenir.fr/high-tec ... -rien.html
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