This gorgeous site offers assets from the Smithsonian and more than 20 environmental organizations on the topic of marine biology. The site is designed to be accessed directly by students and also provides lesson plans and other resources for educators. For another take on this topic, visit the Coral Reef Interactive website.

Experience the excitement of contemporary science and technology through on and offline interactivity with science and technology centers worldwide. It is geared for elementary/middle school students.

The Hobby Shop is the place for hands-on math and science activities. All ages can benefit from access to this site.

NASA.gov brings you images, videos, and interactive features from the unique perspective of America's space agency. Get the latest updates on NASA missions, subscribe to blogs/RSS feeds/podcasts, watch NASA TV live, or simple read about their mission to pioneer the future in space exploration, scientific discovery, and aeronautics research. Check out NASA's Student site (www.nasa.gov/audience/forstudents/index.html) and Educators' site (www.nasa.gov/audience/foreducators/index.html) as well.

A great site for learning about cells through interactive models, animations, and activities. Videos can be downloaded or purchased on CD.

Explore our universe...to scale through this interactive website. Image having your own students create a representation of THEIR universe (to scale!) using Prezi!

This facinating online exhibit from The Field Museum answers many frequently asked questions about DNA in an interactive environment.

The History Channel has developed this site, giving visitors a virtual journey through space while offering photos and facts about Earth and its neighboring planets. Visit Solar System Scope for a different take on this same idea.

This extensive site, operated by The Natural History Museum, offers an online guide to dinosaurs with images, facts, and figures for over 300 dinosaurs.