Never make a calculation until you know the answer. Make an estimate before every calculation, try a simple physical argument (symmetry! invariance! … - Kenneth W. Ford

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Never make a calculation until you know the answer. Make an estimate before every calculation, try a simple physical argument (symmetry! invariance! conservation!) before every derivation, guess the answer to every paradox and puzzle. Courage: No one else needs to know what the guess is. Therefore make it quickly, by instinct. A right guess reinforces this instinct. A wrong guess brings the refreshment of surprise. In either case life as a spacetime expert, however long, is more fun!

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Never make a calculation until you know the answer.

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We live on an island surrounded by a sea of ignorance. As our island of knowledge grows, so does the shore of our ignorance.

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Physicists love this number not just because it is dimensionless, but also because it is a combination of three fundamental constants of nature. Why do these constants come together to make the particular number 1/137.036 and not some other number?

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