Why don't perpetual motion machines ever work? - Netta Schramm
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For more surprising machines that look like they shouldn't be possible check out the double pendulum, sometimes referred to as the chaos machine to get the feel for "quasi-perpetual".
And remember: beware of hoaxes – they all have a hidden engine somewhere!
The photograph of Robert Boyle comes from Wellcome Images, a website operated by Wellcome Trust, a global charitable foundation based in the United Kingdom.
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