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Pauli's Exclusion Principle

In Our Time: Science

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The Importance of Quantum Electrodynamics

In quantum electrodynamics, there is a scale that has to be set somewhere. And this scale is encoded in a number which happens to have the value empirically almost 137. So near to it, people thought it was precisely 137 and that this somehow was significant. Even today, you know, people say, if you're trying to guess a theoretical physicist's pin number, try 137.

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