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" Interactive Science Simulations Fun, interactive, research-based simulations of physical phenomena from the PhET project at the University of Colorado."

"Welcome to Serendip, a playground, including resources and forums, for those who ask questions without boundaries. Glad you stopped by. Need a few pointers to find your way around? Looking for "the answer" to a question? There are plenty of websites out there which will tell you what to think. Serendip instead aims at helping you to think for yourself, and in the process of discovery to formulate new questions and new explorations. Nothing on Serendip is "authoritative", but there is lots here that you can learn from and contribute to. See (and click on) the material below and to the right for recently added discussions. Click here for publishing guidelines."

Online courses in a variety of subject for high school

The Encyclopedia of Life is an online project chronicling every single named plant, animal, fungus and microorganism species on earth. While currently a work in progress, the goal is to create a detailed Web page for each species.The EOL favors substance over style; users won't find flashy animation or crazy layouts here. Instead, visitors get quality scientific information, presented in an easy-to-digest package that doesn't overwhelm the senses.