Galileo Galilei was born in Pisa, Italy on February 15, 1564. Tomorrow his birthday. His father was a musician and wool trader, who wanted his son to study medicine. In 1581, at the age of 17, he entered the University of Pisa to study medicine, as his father wished. At age twenty, Galileo noticed a lamp swinging overhead while he was in a cathedral. Curious to find out how long it took the lamp to swing back and forth, he used his pulse to time large and small swings. Galileo discovered something that no one else had ever realized: the period of each swing was exactly the same. The law of the pendulum, which would eventually be used to regulate clocks, made Galileo Galilei instantly famous.
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