My downstairs neighbors and I were joking that it would be fun to get an ox or two. They could keep our front yard mowed, and tear out all the weeds. They'd be a good source of compost. But most of the time, they'd live in a round pit in the basement, walking in a circle all day and night. They'd be yoked to a shaft that distributes torque throughout the house. You could throw a belt over it and run your washer, dryer, food processor, microwave turntable, etc. In the winter, we'd use the shaft to drive a brake to heat the house.
It would probably be way more efficient to burn the cow's food to run an engine, but hey, cows on treadmills are more fun.
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