Quote of the day
Nothing is impossible in this world. Firm determination, it is said, can move heaven and earth. Things appear far beyond one's power, because one cannot set his heart on any arduous project due to want of strong will.
Louis Leon Thurstone

Born: May 29, 1887
Died: September 30, 1955 (aged 68)
Bio: Louis Leon Thurstone was a U.S. pioneer in the fields of psychometrics and psychophysics. He conceived the approach to measurement known as the law of comparative judgment, and is well known for his contributions to factor analysis.
Known for:
- The nature of intelligence (1924)
- Primary Mental Abilities (1938)