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Ideas about relativity underlie much ancient Greek philosophy, from Protagorean relativism, to Plato's theory of Forms, Aristotle's category scheme, and relatio

Black holes may obliterate most things that come near them, but they saved the theory of general relativity. Einstein's theory was quickly accepted as the true

Entertaining, nontechnical demonstrations of the meaning of relativity theory trace development from basis in geometrical, cosmological ideas of the ancient Gre

An annotated facsimile edition of Einstein's handwritten manuscript on the foundations of general relativity This richly annotated facsimile edition of "The Fou

While the physical sciences are a continuously evolving source of technology and of understanding about our world, they have become so specialized and rely on s