The neutrino turns 60

Project Poltergeist led to the discovery of the ghostly particle. Sixty years later, scientists are confronted with more neutrino mysteries than ever before. In 1930, Wolfgang Pauli proposed the existence of a new tiny particle with no electric charge. The particle was hypothesized to be very light--or possibly have no mass at all--and hardly ever interact with matter. Enrico Fermi later named this mysterious particle the "neutrino" (or "little neutral one"). Although neutrinos are extremely abu...