American Association for the Advancement of Science (AAAS), private organization devoted to furthering the work of scientists and improving the effectiveness of science in the promotion of human welfare. The association was founded in 1848; it presently includes some 143,000 individual members, as well as 296 scientific societies, professional organizations, and state and city academies. AAAS actively promotes science education, and many junior academies of science are affiliated with it. Separate sections of the association represent the various physical and biological sciences, as well as many of the social sciences. It publishes the journal Science.