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Relativity: Einstein's theory of special relativity in multimedia tutorial. The introductory level takes 10 minutes, but has links to over 40 explanatory pages giving greater depth and detail. Einstein Light has a simple introduction to Gal...
Highly recommendable collection of interconnected web pages that serve as an informal introduction to general relativity. While some mathematics is used, the focus is on the key ideas. By John Baez (University of California at Riverside).
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