#### Quote of the day

Work is the order of the day, just as it was at one time, with our first starts and our best efforts. Do you remember? Therein lies its delight. It brings back the forgotten; one's stores of energy, seemingly exhausted, come back to life.

#### 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)