New top story on Hacker News: A Potato Battery Can Light Up a Room for over a Month (2013)
A Potato Battery Can Light Up a Room for over a Month (2013)
23 by miles | 10 comments on Hacker News.
23 by miles | 10 comments on Hacker News.
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New top story on Hacker News: Keyboard that shocks you if you type with incorrect technique [video]
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