In 2012, the biggest experiment in the history of physics paid off: scientists at the Hadron Collider discovered the Higgs-Boson, which helps explain why there is mass in the universe. In March, a team of scientists at the South Pole may have peered back to almost the beginning of time by finding evidence of "gravitational waves." If confirmed, according to theoretical physicist Lawrence Krauss, "it will have increased our empirical window on the origins of the universe by a margin comparable to the amount it has grown in all of the rest of human history." He sits down with Steve Paikin to discuss these recent discoveries and our expanding knowledge of the cosmos.