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vendingmachine commented on the word moisture mill
A machine with a plastic wheel covered with plastic tapes that are coated with spores on one side. Half the wheel is kept in dry air, which causes the tabs to curl up, while the other half is in more humid air, which causes the tabs to straighten out. Left to its own devices, the wheel spins around, and was powerful enough to drive a small toy car.
-"Scientists build toy car propelled by evaporating water", June 2015, The Guardian.
June 17, 2015