This thread is sponsored by @Ngimanene na matharo 's comment on perpetual motion machines.
Perpetual motion refers to an undisturbed movement for eternity. A perpetual machine will need to be in motion for eternity, which is impossible because even the universe itself will not last an eternity. Everything that had a beginning will eventually have an ending. This reminds me of the googol machine.
A googol is a number. 1 followed by 100 zeroes. To theorize a googol machine, Daniel de Bruin built a machine.
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The machine has 100 gears, with a gear ratio of 1 to 10. This means that a gear has to make ten revolutions for the next gear to make 1 rotation. By the time the very last gear makes its first turn on the machine, the first gear would have run a gogool number of times. Unfortunately, there is no energy source in the entire universe that can power the machine simply because it will take the machine more than 13 billion years to run, older than the age of the universe.