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Karl Groos
German psychologist and philosopher (1861-1946).
Born December 10th, 1861 in Heidelberg.
Died March 27th, 1946 at 84 years old in Tübingen.
Occupations
non-fiction writer, psychologist, university teacher
Wikipedia
Count your age by friends, not years. Count your life by smiles, not tears. John Lennon