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" ... And supersymmetry could also help explain dark matter. Several theories of supersymmetry predict that the lighest "partner" particles should have the same properties as physcisists expect for dark matter. But if supersymmetry is so important, then why doesn't the observable universe actually look supersymmetrical? The answer to that question is a concept called supersymmetric breaking, and it's another of the important physics problems Nelson spent her life helping to unravel. ... "