The "sterile" neutrino, once dismissed out of hand as a good idea that just didn't pan out, may have some life left in it yet. When the predicted numbers are off by even the smallest amount, usually there's a new particle hiding out in the woodpile. No, I'm not completely sure what good this will do you and me, but so far no matter how hard physicists try, practical applications always seem to be found for even the most obscure discoveries.