When a physicist has determined the electric charge of one electron, he has determined the charge of all electrons. If the minds of men were like electrons, the tasks of psychologists would be easier. As it is, psychologists rarely bother with the vagaries of a single individual but test, question, examine hundreds—thousands if possible. Some conclusions distilled from such surveys and presented at last week's gathering of 500 psychologists in Ann Arbor, Mich, (see p. 23):
¶ Men whose work is creative reach a peak of productivity at 35, except for poets, who...
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