Aristotle seemed to believe that the speed ratio of an object falling in different materials is the same as the density ratio. Using this logic, an object's speed while falling in a vacuum would be infinite. Since that speed is not possible, a vacuum is not possible.
2,400 years ago, Aristotle was a proto-scientist. He wasn't doing science as we consider it today but for various reasons his ideas stood for two millennia. He was wrong on just about everything.
Turns out, however, that was pretty much correct on the vacuum thing. Interesting.
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