The Three Theorems of Psychohistorical Quantitivity:

The population under scrutiny is oblivious to the existence of the science of Psychohistory.
The time periods dealt with are in the region of 3 generations.
The population must be in the billions (±75 billions) for a statistical probability to have a psychohistorical validity.
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Biography
Profession:
Scientist
Nationality:
American
Born:
January 2, 1920
Died:
April 6, 1992