Most famous for his declaration “Cogito, ergo sum” (“I think, therefore I am”), Descartes was an important 17th-century French philosopher. In addition to linking the study of algebra to the study of geometry, Descartes pioneered what Kuhn calls the “mechanico-corpuscular” view of the universe. According to this view, all things in the universe were made of tiny bodies (corpuscles), and all motion was created by these corpuscles bumping into one another. Mechanico-corpuscular physics then cast doubt on Aristotle’s belief that objects had innate properties.