Gateway to authoritative science information provided by U.S. government agencies including research and development.
Site has clear, easy-to-understand explanations. Browse the categories or use the search feature to find information about machines, electronics, cars, the human body and much more.
The latest news and articles about scientific topics and health information. Also offers newsfeed and e-mail newsletter.
Searchable collection of over 100,000 photos related to science and technology.