How to Make an Infinitely Looping Water Fountain

Arrange two watering cans so that they overflow into each other. Fill them both, then add water to one of them. The excess water will flow into the other, then back again.

I'm not a science person, but video seems fishy to me. If real, wouldn't this be a perpetual motion machine?

-via Laughing Squid

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Yeah, the pump is in the black can, he filled it carefully in step 2, so that the intake vent (which is placed high up) was covered and the pump could start the cycle.
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