In 1589 Galileo Galilei is said to have dropped two spheres of different masses from the Leaning Tower of Pisa to demonstrate that both will hit the ground at the same time, disproving a millennia old Aristotlean view. You have heard this story many times, but there is no account by Galileo himself of such an experiment.

Can you swing a bucket of water around in a circle over your head without getting wet?

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