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Learn about the over 800 people who have been featured on US postage stamps, from presidents and explorers to artists and musicians. See their names, years, and brief descriptions of their notability.
The Standard Model is a theory that describes three of the four fundamental forces and classifies all known elementary particles. It includes quarks, leptons, gauge bosons, and the Higgs boson, and has been confirmed by many experiments, but leaves some phenomena unexplained.
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