Word: rabie
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Dates: during 1990-1999
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...seemed. In the former category, for example, is the 1936 discovery of a new particle, the muon, an elementary particle similar to the electron but more massive. Existing theories had predicted no such thing, and its appearance greatly complicated high-energy physics. "Who ordered that?" grumbled theorist I.I. Rabi at the time. But the muon and its kin led eventually to a new understanding of the subatomic world...