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Although this collection is discontinued, it's host HHMI, offers a variety of other award-winning, free resources for science educators and students. Here you'll find lectures, classroom activities, illustrations, animations, and much more.
NSDL is the nation's online portal for education and research on learning in Science, Technology, Engineering, and Mathematics. Website sections contain resources for K-12 and College educators as well as librarians.
Scitable is a free science library and personal learning tool brought to you by Nature Publishing Group, the world's leading publisher of science. Scitable currently concentrates on genetics and cell biology, which include the topics of evolution, gene expression, and the rich complexity of cellular processes shared by living organisms. Scitable also offers resources for the budding scientist, with advice about effective science communication and career paths.
"The Royal Society of Chemistry's interactive periodic table features history, alchemy, podcasts, videos, and data trends across the periodic table. Click the tabs at the top to explore each section. Use the buttons above to change your view of the periodic table and view Murray Robertson’s stunning Visual Elements artwork. Click each element to read detailed information".