Scientists have spent the better part of the last eight decades trying to find, in essence, a magnet with only one pole. A team working at the National Institute of Standards and Technology (NIST) has found one.
In 1931, Paul Dirac, one of the rock stars of the physics world, made the somewhat startling prediction that "magnetic monopoles," or particles possessing only a single pole—either north or south—should exist. His conclusion stemmed from examining a famous set of equations that explains the relationship between electricity and magnetism
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