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The Unruly Neutrino

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Science  06 Sep 2013:
Vol. 341, Issue 6150, pp. 1058
DOI: 10.1126/science.341.6150.1058

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Contrary to the assumptions of the standard model, particles called neutrinos have mass and, thus, behave in ways forbidden by the theory. So neutrinos provide particle physicists with their only glimpse so far of physics beyond the standard model. Even in this area, however, a generally accepted picture is emerging of how, like chameleons changing colors, the three "flavors" of neutrinos morph into one another as they zing along at near light speed.