You’re an independent-minded person. You make choices for yourself based on the best information available. You own your decisions, right or wrong. Right? No so fast. You are, in fact, a social animal. You take many visible and invisible cues on how to behave from the people around you—family, co-workers, friends, social media, even the folks in the elevator or on the bus. So your decisions and behaviors aren’t always as independent as you might think. In this episode of Choiceology with Katy Milkman, we look at a phenomenon that may have you running with the crowd, even when it’s not in your best interest. The episode begins with an experiment. A benign but peculiar behavior appears during an otherwise normal orchestra rehearsal. It starts with a few members but spreads rapidly through the orchestra. What’s causing this behavior, and why is it so contagious? From there we move to a much more consequential behavior in the world of professional cycling. We examine a high-stakes decision by cyclist Tyler Hamilton in his quest for Tour de France glory and Olympic gold. It’s a story of peer pressure, deep secrets, subterfuge and, ultimately, redemption. Behavioral scientist Todd Rogers of the Harvard Kennedy School explores the myriad ways we’re influenced by those around us. He speaks with Katy about some of the ways that businesses and institutions can harness our social nature for the greater good. Finally, Katy Milkman looks back at some of the early research on how individuals can be manipulated by social groups. She offers tips to help you avoid falling victim to mob mentality.