Woodworker Matthias Wandel built an impressive slinky escalator machine that helps keep the toy in motion for extended periods of time. Matthias Wandel/YouTube For decades, the question of how to keep ...
Perpetual motion devices are either a gag, a scam, or as in the case of this particular toy that [Big Clive] bought on AliExpress, a rather fascinating demonstration of a contact-free inductive sensor ...
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