Staffan de Mistura; Gravitational Waves; Von Miller

A discussion with Staffan de Mistura, the U.N. special envoy for Syria, who participated in meetings in Munich where world powers agreed to deliver aid to cities under siege and help to end hostilities. A panel discusses the announcement by physicists that they've detected gravitational waves—predicted by Albert Einstein in 1916—for the very first time. Von Miller, outside linebacker for the Denver Broncos and Super Bowl 50 MVP, describes his fellow teammates, coach Wade Phillips, and the defensive principles that enabled the Broncos to win an NFL championship.