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"Still it would be a great mistake to abandon your work on the perpetual motion machine."
For years he had spent every free moment working on his perpetual motion machine. So far, he was up to 18 seconds.
Roller Coaster Ski Ramp
The Perpetual Motion (just a figure of speech) Institute.
'That dog will do anything for a biscuit.'
The Sisters of Perpetual Motion enjoy a game of leap frog.
Edna's vocal chords - the human perpetual-motion machine...