A nonzero theta 13 is good news for physicists hoping to explore the differences between neutrinos and antineutrinos, should any such differences exist. (In fact, in another bit of neutrino slipperiness, it may be that neutrinos are their own antiparticles.) Any such differences may bear on the lingering question of why there is so much matter around, and so little antimatter, when both should have come out of the big bang on equal footing. One kind of matter–antimatter bias, a phenomenon known as CP violation, has been observed in other particles, and the new findings indicate that it might be demonstrable in neutrinos as well. "Theta 13 is the key parameter governing whether we can explore CP violation or not," says physicist Kam-Biu Luk of Lawrence Berkeley National Laboratory and the University of California, Berkeley, who serves as co-spokesperson for the experiment. "Now, with theta 13 being nonzero, there's a chance that we may find CP violation in the neutrino sector." Read More