#### Quote of the day

I was in Deadwood at the time and on hearing of the killing made my way at once to the scene of the shooting and found that my friend had been killed by McCall.

#### Harold Jeffreys

**Born:**April 22, 1891

**Died:**March 18, 1989

**(aged 97)**

**Bio:**Sir Harold Jeffreys was an English mathematician, statistician, geophysicist, and astronomer. His book Theory of Probability, which first appeared in 1939, played an important role in the revival of the Bayesian view of probability.

**Known for:**

- Scientific inference (1931)
- Methods of Mathematical Physics (1946)
- Theory of probability (1939)
- The earth (1929)
- Cartesian tensors (1931)