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Andromeda Galaxy Turns 100 Years Old, Here Is Why This Matters
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QED: experimental evidence
The theory of quantum electrodynamics (QED) is perhaps the most precisely tested physics theory ever conceived. It describes the interaction of charged particles by emitting photons. The most precise prediction of this very precise theory is the magnetic strength of the electron, what physicists call the magnetic moment. Prediction and measurement agree to 12 digits of precision. In this video, Fermilab’s Dr. Don Lincoln talks about this amazing measurement.
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http://www.youtube.com/watch?v=hHTWBc14-mk
http://www.youtube.com/watch?v=nYDokJ2A_vU
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