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.
Keith Edward Bullen
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Born: June 29, 1906
Died: September 23, 1976 (aged 70)
Bio: Keith Edward Bullen FAA FRS was a New Zealand-born mathematician and geophysicist. He is noted for his seismological interpretation of the deep structure of the Earth's mantle and core.