Physicists at Fermilab, the world's most powerful particle accelerator laboratory, are closing in on one of the universe's best-kept secrets: why everything has mass. With the Tevatron, a four-mile underground particle accelerator, the scientists smash matter together at nearly the speed of light to find a particle theorized forty years ago by Scottish scientist Peter Higgs. Scour the subatomic world for the Higgs. Will the discovery happen?