For a few weeks every year starlings migrate, creating shifting, synchronized formations of nearly a million birds that flow across the sky like a well-choreographed dance. How does each bird anticipate where its neighbor will fly? Studying data from Google allows analysts to predict flu outbreaks—so why can’t weather be forecast more than a few days in advance? And if winning a game of Rock, Paper, Scissors depends on random chance, how is it that some people continually beat the odds? In this program, Professor Marcus de Sautoy discusses mathematical models that help predict outcomes, touching on game theory, chaos theory, and the butterfly effect. Produced by the Open University. Part of the series The Math Code. (60 minutes)