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NASA
Nasa: Newton's Theory of "Universal Gravitation"
This site, which is provided for by NASA, discusses the thinking which led Newton to understand universal gravitation.
Internet History Sourcebooks Project
Fordham University: Modern History Sourcebook: Principles of Natural Philosophy
This site from Fordham University is an exerpt from Newton's famous "Principia."
Physics Classroom
The Physics Classroom: Circular and Satellite Motion: The Inverse Square Law
Through illustrated examples and interactive practice, students explore Newton's ability to relate the cause for heavenly motion (the orbit of the moon about the earth) to the cause for Earthly motion (the falling of an apple to the...
University of South Florida
Educational Technology Clearinghouse: Lit2 Go: History of Mathematics
Short selections from W. W. Rouse Ball's "A Short Account of the History of Mathematics," most of which are biographies that focus on the mathematician's work. The text can be read online or downloaded by individual chapters in MP3 or...
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