 | American physicist Albert Einstein: From before 1920 until his death, Einstein struggled to find laws of physics far more general than any known before. In his theory of relativity, the force of gravity had become an expression of the geometry of space and time. The other forces in nature, above all the force of electromagnetism, had not been described in such terms. But it seemed likely to Einstein that electromagnetism and gravity could both be explained as aspects of some broader mathematical structure. The quest for such an explanation -- for a "unified field" theory that would unite electromagnetism and gravity, space and time, all together -- occupied more of Einstein's years than any other activity. |
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