American Academy of Arts and Sciences
Honorary society that recognizes achievement in the natural sciences, social sciences, arts, and humanities and conducts a varied program of projects and studies responsive to the needs of society. Features publications in PDF format, news, events calendar, as well as lists of members and fellows.
http://www.amacad.org/
National Endowment for the Humanities
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Supports learning and funds research, education, museum exhibitions, documentaries, and preservation activities in the United States. Offers news and publications, as well as descriptions of current projects.
http://www.neh.fed.us/