Experimental physicists have found that the electron has an intrinsic mass or "weight" of about .0000000000000000000000000009 gram. This quantity is usually represented by the convenient symbol m. Both experimental and mathematical physicists have regarded m as a major constant of nature, a foundation stone of the universe.
Last week as hundreds of the nation's scientists journeyed home from the midwinter convention of the American Association for the Advancement of Science, physicists were excited and disturbed because doubt had been cast on the constancy of m. The doubter was Professor George Eric...
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