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The Historyscoper's Science and Technology Watch Blog Apr. 2, 2015

Tuesday, July 26, 2016

This pen makes drawings that conduct electricity (video)

https://www.youtube.com/watch?list=PLKfWL8IXgKBte4TfD53pLaHONfSYCX0RH&v=mXJAGEE0av8
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