"The chief attraction of the theory lies in its logical completeness," wrote Albert Einstein after publishing his general theory of relativity in 1915. "If a single one of the conclusions drawn from it proves to be wrong, it must be given up; to modify it without destroying the whole structure seems to be impossible."
Scientists have been rising to the challenge ever since. Not that they have been motivated by a desire to destroy Einstein's remarkable intellectual achievement—which explains gravity and the large-scale behavior of the universe on the basis of relative motion. Their ingenious tests have...
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