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For Symmetry Magazine:
If you chop a magnet in half, you end up with two smaller magnets. Both the original and the new magnets have “north” and “south” poles.
But what if single north and south poles exist, just like positive and negative electric charges? These hypothetical beasts, known as “magnetic monopoles,” are an important prediction in several theories.
Like an electron, a magnetic monopole would be a fundamental particle. Nobody has seen one yet, but many—maybe even most—physicists would say monopoles probably exist. (Read the rest at Symmetry Magazine…)