Holiday Hours: APS offices, Library, and Museum are closed Thursday and Friday, November 24 and 25. The Museum exhibition is open 10 a.m.-5 p.m. Saturday and Sunday, November 26 and 27. 

The American Philosophical Society is the oldest learned society in the United States. Founded by Benjamin Franklin in 1743, it continues its mission of "promoting useful knowledge" through research, fellowships, and public outreach.