The American Association for the Advancement of Science (AAAS)
http://www.aaas.org/
AAAS is an international non-profit organization dedicated to advancing science around the world by serving as an educator, leader, spokesperson and professional association.

The National Academy of Sciences
http://www.nasonline.org/
The National Academy of Sciences (NAS) is a private, non-profit society of distinguished scholars engaged in scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the public good. An Act of Congress, signed by President Abraham Lincoln in 1863 at the height of the Civil War, calls upon the NAS to provide independent advice to the government on matters related to science and technology.

NASA
http://www.nasa.gov/
The National Aeronautics and Space Administration was established by President Dwight D. Eisenhower in 1958. Visit nasa.gov to learn more about the space agency. The NASA page also features some fabulous photo and video galleries of space.

Popular Science
http://www.popsci.com/science
Popular Science has been a leading source of science and technology news since its inception way back in 1872. PopSci.com first came online in 1999, and in 2008 we launched our biggest redesign yet: a new site built in Drupal that’s easy to navigate and chock-full of exciting daily content. Home page for Popular Science Magazine.

Proceedings of the National Academy of Sciences of the United States of America
http://www.pnas.org/
PNAS is one of the world's most-cited multidisciplinary scientific serials. Since its establishment in 1914, it continues to publish cutting-edge research reports, commentaries, reviews, perspectives, colloquium papers, and actions of the Academy.

Science Center of Iowa
http://www.sciowa.org/
Experience the Science-Surrounds-Us-All Actuality at this 110,000 square-foot creative lifelong learning center in the heart of Downtown Des Moines. By placing the power of learning in the hands of the visitor with interactive experiences for all ages, the emphasis at SCI is less on what to learn and more on how to learn.

Science.gov
http://www.science.gov/index.html
Science.gov is a search engine for government science information and research results. Science.gov provides search of more than 50 million pages of science information with just one query, and is a gateway to over 1,800 scientific Web sites.

Science Magazine
http://www.sciencemag.org/
Founded in 1880 on $10,000 of seed money from the American inventor Thomas Edison, Science has grown to become the world's leading outlet for scientific news, commentary, and cutting-edge research, with the largest paid circulation of any peer-reviewed general-science journal. Home page of Science Magazine.

Science News
http://www.sciencenews.org/
Science News has been published since 1922. This award-winning biweekly news magazine covers important and emerging research in all fields of science. It publishes concise, accurate, timely articles that appeal to both general readers and scientists, reaching nearly 130,000 subscribers and more than one million readers.

United States Geological Survey
http://www.usgs.gov/
As an unbiased, multi-disciplinary science organization that focuses on biology, geography, geology, geospatial information, and water, the USGS is dedicated to the timely, relevant, and impartial study of the landscape, our natural resources, and the natural hazards that threaten us.