Scientists have discovered a new type of supernova which could help explain the ratio of matter to antimatter in the universe. It seems that if a white dwarf were to suck the helium off a red giant companion, the kind of explosion eventually generated would not only account for the weird supernova seen in 2005 in a galaxy 100 million light years away, it would also account for the previously unexplained ratios of various sorts of positrons seen in the centers of galaxies. I think. Cosmology is hard.