The Number on the Wall: Why Physicists Call 137 Magic
I came to 137 the way most people come to it, by hearing it called a magic number and wanting to know whether the word was earned. My instinct with a claim like that is suspicion, because a working life spent around language and persuasion teaches you how easily a large word gets draped over a small thing. This time the suspicion did not survive the facts. The number turned out to be real in a way I had not expected, and the people most gripped by it have been some of the hardest-headed physicists who ever lived.

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