Dealt in reason through meditations. He famously claimed, "I think therefore I am." He was considered to be the Father of Modern Philosophy.
He studied law at the University of Poitiers in accordance with his father's wishes.
His innovations in mathematics influenced how graphing was done.
His mother died when he was only one. He had a daughter named Francine Descartes.
He was one of the major players during the Scientific Revolution along with Galileo Galilei.