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Arthur Koestler

5 September 1905-1 March 1983

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Creativity is a type of learning process where the teacher and pupil are located in the same individual.

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Geometry is the purest realization of human reason; but Euclid's axioms cannot be proved. He who does not believe in them sees the whole building crash.

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Humor is a type of stimulation which tends to elicit the laughter reflex.