Johannah Perry

Physicist, mathematician and inventor. Laid the foundation of classical mechanics, which formed the basis of physical science until Einstein. Formulated universal laws of motion and the law of universal gravitation. Demonstrated how these laws explained both the motion of planets and comets and objects on Earth. Invented a form of the calculus. Invented the first practical reflecting telescope. Proposed that Earth was an oblate spheroid. Calculated the speed of sound.