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there will never again be true (I hate to use this cliched term) "Renaissance Men", that is those who have a fundamental grasp of all areas of science and mathematics.

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Indeed, in mathematics alone nobody has had a substantial grasp of much of the field since around the turn of the last century, and the men I am thinking of, Hilbert and Poincare, were geniuses of the highest caliber.

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But even today, a Fields Medalist in mathematics or a Nobel laureate in physics...

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FYP.