orces that control human behavior. But you don’t have to go to NPR or even iTunes to get in on the podcast surge these days. After ten years of downloading and experimentation and growth, podcasts are now all over the place. No radio tower required. No broadcast. Just you and your smartphone and a million options. Well, lots of options. Updated all the time. “Serial.” Snooki. Sports. This hour On Point: the podcast surge, and what it means for the future of listening – of news, of entertainment — of public radio.