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Physicist Polykarp Kusch standing at a blackboard, pointing at a calculation of the electron magnetic moment. He is wearing a dark suit with a white shirt, and a dark tie with small, light colored diamond shapes on it. Kusch is wearing glasses and appears to be in the middle of saying something to someone in the audience.

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Physicist Polykarp Kusch standing at a blackboard, pointing at a calculation of the electron magnetic moment. He is wearing a dark suit with a white shirt, and a dark tie with small, light colored diamond shapes on it. Kusch is wearing glasses and appears to be in the middle of saying something to someone in the audience.
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Robert McNees (mcnees@mastodon.social)'s status on Thursday, 26-Jan-2023 15:44:32 UTC Robert McNees

Physicist Polykarp Kusch was born #OTD in 1911.
Kusch measured the magnetic moment of the electron and found that its value disagrees with naive predictions by a tiny amount — about 1 part in a thousand, or 0.1%.
Quantum Electrodynamics offers a marvelous explanation of this discrepancy.
Image: AIP

In conversation Thursday, 26-Jan-2023 15:44:32 UTC from mastodon.social permalink