There is a 75% chance that physicists analyzing tests results from a Minnesota mine found dark matter particles. The rumored substance is believed to make up 80% of the universe, but heretofore evaded capture

This isn't the first such discovery, nor is it definitive. But scientists feel three or four more detections by the experiment, now being upgraded, would constitute proof.The results are “potentially very exciting,” according to Craig Hogan of the University of Chicago and Fermilab, who was not on the research team. (Amy Crocker)