bn:03761701n
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Between 1589 and 1592, the Italian scientist Galileo Galilei is said to have dropped two spheres of the same volume but different masses from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass, according to a biography by Galileo's pupil Vincenzo Viviani, composed in 1654 and published in 1717. Wikipedia
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