The Universe of Particles exhibition at CERN in 2011.
Fabrice Coffrini/AFP/Getty Images
November 21, 2012 Theories are the life-blood of science; but ruling them out may be harder than you think. And letting a cherished model fall on the trash heap of history is even harder, yet. Take "supersymmetry" from the world of particle physics, for example. When might we see its demise or its vindication?
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