The first direct observation of a muon neutrino turning into a tau neutrino at the Gran Sasso underground laboratory in Italy confirms that indeed neutrinos do oscillate among “flavors.” Berkeley Lab’s Kevin Lesko says the result “really nails the neutrino oscillation phenomenon.”

U.S. Department of Energy scientists and administrators join members of the National Science Foundation and South Dakota’s Sanford Underground Laboratory for the deepest journey yet to the proposed site of the Deep Underground Science and Engineering Laboratory (DUSEL).