Galileo Galilei to Einstein's special theory of relativity. A biography by Galileo's pupil Vincenzo Viviani stated that Galileo had dropped balls of the same material, but different masses, from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass. This was contrary to what Aristotle had taught: that heavy objects fall faster than lighter ones, in direct proportion to weight. While this story has been retold in popular accounts, there is no account by Galileo himself of such an experiment, and it is generally accepted by historians that it was at most a thought experiment
Italian submarine Galileo Galilei machine guns. "Galileo Galilei" was built at Tosi shipyard at Taranto. She was launched on March 19, 1934 and commissioned on October 16 of the same year . After delivery, "Galileo Galilei" together with other submarines of "Archimede"-class was assigned to 12th Squadron of the III Flotilla, later to become 41st and then 44th Submarine Squadron of the VII Submarine Group, based at Taranto. After a period of intensive training and short cruises, the Squadron was sent for training to Tobruk. In 1937, along with many other submarines of the Royal Italian Navy ("Regia Marina"), "Galileo Galilei" secretly participated in