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| птичка Хоттабыча (A toy heat engine that mimic the motions of a bird drinking from a water source. They are sometimes incorrectly considered examples of a perpetual motion device Aly19) | |||
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| птичка Хоттабыча (A toy heat engine that mimic the motions of a bird drinking from a water source. They are sometimes incorrectly considered examples of a perpetual motion device Aly19) | |||