Quote of the day
If a man insisted always on being serious, and never allowed himself a bit of fun and relaxation, he would go mad or become unstable without knowing it.
Tjalling Koopmans
Born: August 28, 1910
Died: February 26, 1985 (aged 74)
Bio: Tjalling Charles Koopmans was a Dutch American mathematician and economist, the joint winner with Leonid Kantorovich of the 1975 Nobel Memorial Prize in Economic Sciences.