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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."
Other
Ancient Greek Philosophy: Thales of Miletus
Includes a short summary of the life and work of the Greek philosopher Thales of Miletus. Discusses his life, work in Astronomy and Mathematics, and view of water and pantheism. Also includes a couple of quotations that make reference to...
Libre Text
Libre Texts: Chemistry: Black Hole Thermodynamics
Why did black holes enter the realm of thermodynamics? This concise article dives into the history.