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The hosts of “Radiolab,” Jad Abumrad and Robert Krulwich, take us behind the scenes of their award-winning show and give us a preview of their upcoming season. Robert Jay Lifton talks about how he became a passionate social activist by studying the impact of war and cruelty. Jim Axelrod explains how his quest to run the New York City Marathon became an emotional journey about his father, his marriage, and his career. Plus, on this week’s Please Explain, find out how much you really save when you use coupons—and what about that newcomer Groupon?