The American Association for the Advancement of Science (AAAS) is an American international non-profit organization with the stated goals of promoting cooperation among scientists, defending scientific freedom, encouraging scientific responsibility, and supporting scientific education and science outreach for the betterment of all humanity. It is the world's largest general scientific society, with 126,995 individual and institutional members at the end of 2008, and is the publisher of the well-known scientific journal Science, which has a weekly circulation of 138,549.