Philosophical Society of Washington
Its aims are "the promotion of science, the advancement of learning, and the free exchange of views among its members on scientific subjects."
Meetings are roughly every other friday, except in the summer. Meetings are free and open to the public. A lecture is given by a scientist at each meeting. Past speakers have included Fraser Stoddart and Leroy Cronin.
- Archive of Guest Lectures, Philosophical Society of Washington, Accessed 2013-06-22.