american philosophical society
oldest extant learned society in the United States, founded under the impetus of Benjamin Franklin in 1743. At the beginning of the 21st century, it had more than 850 members, elected for their scholarly and scientific accomplishments in any of five areas-the mathematical and physical sciences; the biological sciences; the social sciences; the humanities; and the arts, professions, and leaders in public and private affairs. Its headquarters are in Philadelphia, Pennsylvania.
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