Plus Advent Calendar Door #3: Sports on saturday
Tennis anyone? Fancy football? Whatever game you are playing (or watching) this weekend, find out the maths behind two favourite sports.
What makes a perfect football? Find out why the ball's surface is the most prized research goal in ball design.
Learn about the aerodynamics of footballs and perfect your free kick.
What tactics should a soccer player use when taking a penalty kick? And what can the goalkeeper do to foil his plans?
Over recent decades new materials have made tennis rackets ever bigger, lighter and more powerful. So what kind of science goes into designing new rackets?
What is the chance of another Isner-Mahut mega set at Wimbledon?
What does it take to win Wimbledon?