Professor Marcus du Sautoy - mathematician, footballer and amateur musician - shows how mathematicians have contributed to our understanding of the world around us for millennia. We are all taught how fundamental maths is to the world we live in. But did you know that Wayne Rooney solves a quadratic equation every time he connects with a cross to put the ball in the back of the net? That we use prime numbers when we shop on the Internet? In this lecture Professor Marcus du Sautoy - mathematician, footballer and amateur musician - shows how mathematicians have contributed to our understanding of the world around us for millennia. Mathematician Professor Marcus du Sautoy is our Simonyi Professor for the Public Understanding of Science. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/