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PostPosted: Sun Jan 10, 2016 2:58 pm 
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Joined: Fri Oct 13, 2006 6:00 pm
Posts: 4091
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The energy source of the futur is around of the "corner".

Yep, most of us have used them. They are call "solar cells"

You've problably seen calculators with solar cells devices that never need batteries and in somes cases, don't even have an off button....(I have two) :mrgreen:
http://science.howstuffworks.com/enviro ... r-cell.htm


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