“This is the reason why all attempts to obtain a deeper knowledge of the foundations of physics seem doomed to me unless the basic concepts are in accordance with general relativity from the beginning. This situation makes it difficult to use our empirical knowledge, however comprehensive, in looking for the fundamental concepts and relations of physics, and it forces us to apply free speculation to a much greater extent than is presently assumed by most physicists.”

—  Albert Einstein

1950s, On the Generalized Theory of Gravitation (1950)

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German-born physicist and founder of the theory of relativi… 1879–1955

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