For a non-technical introduction to the topic, please see Introduction to Quantum mechanics. ... Wikisource has original text related to this article: Relativity: The Special and General Theory Albert Einsteins theory of relativity, or simply relativity, refers specifically to two theories: special relativity and general relativity. ... The 20th century extended from the first day of 1901 to the last day of 2000 according to the Gregorian calendar. ...
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History of physics
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