A friendly and fun introduction to chemistry! Topics covered include matter, atoms, elements & the periodic table, chemical reactions, and biochemistry. Also includes online quizzes.

A fun way to learn physics concepts! Design a roller coaster, predict the outcome in bumper cars, learn about the free fall and pendulum, and visit other resources on physics.

An engaging site full of great diagrams and information on matter, particles, and touching on other physcial science concepts. The main section is a lengthy series of pages reading like a good book. Also features printable worksheets, a glossary, and physics news via Physics Central.

Great interactive site encompassing a broad range of energy-related topics: conservation, scientists, "how it works", transportation, energy in the news, and more. Also includes teacher resources and printable activities.

Learn about renewable energy on this colorful and interesting site by the U.S. Department of Energy. Learn ways to save energy and have fun playing some energy-related games as well.

Several interactive periodic tables and details on each chemical element such as atomic number, atomic mass, electron configuration, melting and boiling points, date of discovery, and more.

Another periodic table website - this one from the UK. Essential information about each element, as well as its properties and common compounds. Includes images of elements.

Another periodic table, but this one has more detailed information on each element's uses along with its effect on the environment and human health.

Fun site full of information on various aspects of optical science: light and color, rays, vision, and optics in nature and in medicine. Includes printable lesson plans and a teen website.

Online exhibit on aerodynamics and the history of flight, with teacher resources and ideas for constructing flight models.