A prolific American author and biochemistry professor, Asimov was one of the "Big Three" science fiction writers.
: Co-invented infinitesimal calculus (sharing credit with Leibniz) to describe rates of change.
: Formulated the Three Laws of Motion and the Law of Universal Gravitation , which explained planetary orbits and terrestrial gravity.
: Philosophiæ Naturalis Principia Mathematica (1687) is considered the seminal work of the Scientific Revolution. 2. Isaac Asimov (1920–1992)