Great Thinkers Datebook: March 31.
Rene Descartes, French philosopher, mathematician and physicist famous for 'Cogito Ergo Sum' - 'I think therefore I am - turns 412. He was born March 31, 1596. He is known as the 'father of modern philosophy,' and to physicists, he discovered the law of refraction.
Link to full article ... Rene Descartes
Other great thinker celebrants:
Sir Lawrence Bragg (1890), Australian-born British physicist, shared 1915 Nobel Prize with his father Sir William, for work on crystal structure.
Robert Bunsen (1811), German chemist, invented and improved electrochemical battery and gas burner (named in his honor) and photometer. He also discovered elements cesium and rubidium.
Franz Joseph "Papa" Haydn (1732), Austrian composer, known as the 'father of the symphony'
Sergei Diaghilev (1872), Russian artistic impresario who founded the Ballets Russes