4. Galileo Galilei
(15 February 1564 – 8 January 1642)
INVENTION: Law of Pendulum
Galileo was one of the youngest people with great inventions; he was born in Pisa, Italy. He was the oldest on his seven siblings. His father was a musician and wool trader. His father wanted him to study medicine. At the age of 17, in 1581, he was sent to study medicine in the University of Pisa. In 1582, while he was at a cathedral, he noticed a lamp swinging over his head.
His curiosity made him found out that how long it took the lamp to swing back and forth. To notice the time of large and small swings, he used his pulse. Galileo discovered that each swing has exactly the same period. He carried out a number of experiments. He sat up a number of different pendulums. Galileo discovered that regardless of the difference of sizes, the pendulums kept time with each other. Thus he formed the law of pendulum which was eventually used to regulate clocks.