Bots — accounts with no human oversight — rule Twitter. According to a Pew Research analysis of more than 1.2 million public tweets, an astounding 66 percent of links tweeted are shared from bots. Enter accidental tech superheroes Ash Bhat and Rohan Phadte who, in the spring of their sophomore year at UC Berkeley, launched a counterattack called Botchek.me. Hear how two 20-year-olds are changing the way we see news and filter out propaganda. Underwritten by Comcast NBCUniversal.