Tornadoes – Scott Pelley reports on the new science ofsuperstorms. What spawned one of the most devastating swarms oftornadoes ever to tear through the United States? Pelleyreports from Kentucky, where more than 70 people were killedlast weekend and billions of dollars in lossesoccurred. America's Dirty Secret – Bill Whitaker reportsfrom Alabama's Black Belt, ground zero in an unseen publichealth epidemic: by some estimates, half the impoverished,rural residents in Lowndes County have raw sewage spilling intotheir yards and even their homes. Sanitary wastewater disposalis required by the state but not provided to residents outsidesmall towns, leaving many living in the countryside who can'tafford it with no sewage systems at all. Whitaker speaks withfamilies battling conditions you'd never expect to see in theheart of America and meets one advocate who hopes to exposewhat she calls "America's dirty secret." Trevor Noah –Trevor Noah is an unstoppable comedic force. As host of "TheDaily Show," he has attracted widespread and sometimes viralattention for his heartfelt and cutting socialcommentary. Forbes ranked him the fourth-highest-earningcomedian, and Time named him one of its 100 most influentialpeople. Lesley Stahl interviews Noah, currently on the roadwith his latest comedy tour.
