Galileo Galilei (15 February 1564 – 8 January 1642) was an Italian physicist, mathematician, astronomer, and philosopher. Iniitally enrolled in medical school, Galileo decided not to become a doctor but instead, to pursue the study of science which he loved. This great Italian scientist played a crucial role in the Scientific Revolution. He dispelled misconceptions of Aristotle, proving that objects of different weights would fall at the same speed. He was brave enough to challenge the traditional misconception that the earth was at the center of the universe, and taught that it was the sun that was at the universe's center. He discovered that a pendulum, no matter how far it swept, would take the same amount of time to complete the sweep. Galileo was one of the first modern scientists to clearly state that the laws of nature are mathematical. His work helped to separate science from both philosophy and religion. He helped improve the telescope - amongst many other great scientific discoveries.