René Descartes (1596–1650), often called the lived a life defined by extensive travel, military service, and a radical pursuit of certain knowledge. While he is most famous for the phrase "I think, therefore I am" ( Cogito, ergo sum ), his biography reveals a man equally dedicated to mathematics and the physical sciences. Key Life Epochs
A Guide to René Descartes' Life and Philosophy - MasterClass Descartes: A Biography
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