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According to the Touchspin (Design) Chemistry Web site, "Some other sites have more in depth information on chemistry, but I double-dog-dare-you to find anyplace with a better interactive periodic table. None other have the features and capabilities that this one offers." You can check out those features at the tool's FAQ page. When you're done, check out the site's new Biology area and find out what a horsefly's eye - or a pig's gall bladder -- look like under a microscope.

The goal of Encyclopedia of Life is to be a portal to information about all species of life on Earth. Ultimately, the Encyclopedia hopes to "serve as an online reference source and database for every one of the 1.8 million species that are named and known on this planet, as well as all those later discovered and described. Encyclopedia of Life will be used as both a teaching and a learning tool, helping scientists, educators, students, and the community at large gain a better understanding of this planet and all who inhabit it." Many resources are available already, however, this site always will be a work in progress.

Discover how physics laws affect ride design whle designing your own roller coaster.

Red Gold: The Epic Story of Blood Developed as a companion to the PBS series Red Gold: The Epic Story of Blood, this site is rich in content and interest, providing information about such topics as blood composition, circulation, typing, donations, and more. Visitors can take a multimedia journey that follows a pint of blood through the transfusion process, learn the basics about blood, and trace the history of blood through an interactive timeline. Middle- and high-school teachers also will find lesson plans and a 12-page discussion guide.

Through the use of colorful text and interactive games, this engaging site from the American Museum of Natural History teaches about the causes of infection, and about how to detect and prevent infection. The site includes facts about infections, interactive games that teach about microbes and bacteria, tips on solving microbe mysteries, and more.

Engineering and technology lessons for children!

Open-source library of electronic modules that snap together with tiny magnets for prototyping and play.

great website for experiments

Fun, interactive, research-based simulations of physical phenomena for free

This site is a fun, interactive way to learn about the solar system. It has a section to learn about the individual planets along with the different moons, asteroids, and comets. It would be a good website to have in your classroom for students to explore at their leisure.

Free educational resources for teachers, students and parents.

AP science teachers using vodcasts to enhance their courses.

Online scientific calculator.

Phases of the Moon java applet