On July 18, 1635 (according to the old Julian calendar), English natural philosopher, architect and polymath Robert Hooke was born. He is known for his discovery of the laws of elasticity, now known as Hooke's law. Hooke did research in a remarkable variety of fields. He was one of the first men to build a Gregorian reflecting telescope and to suggest that Jupiter rotates on its access. His studies of microscopic fossils are what led him to be one of the first proponents of a theory of evolution.