Microblog post: "My son is only in 10th grade and look what he invented!! Harvard here we come!". Pictures of a frame that holds a cable that can be attached to the metal of a power plug
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[–] 1 point 1 day ago (1 child)

There are legal ones for generators (especially small scale solar stuff) that turn off automatically when they detect no main power on the line, so grid workers can't get zapped. They are pretty common around here.

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