Galileo published Du Motu (On Motion)

an analysis of falling objects that departed from the traditional Aristolian views.  At this time, he was teaching at the University of Pisa.  Here he conducted his famed experiments on falling objects.  It is said that he demonstrated these bold ideas by dropping two cannonballs of different weights off of the leaning tower of Pisa, showing that they accelerated at the same rate. 

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