New Scientist: The Royal Bafokeng Stadium in Rustenburg, South Africa, is the site of Saturday’s World Cup clash between the US and English soccer teams. At 1500 km above sea level, the Royal Bafokeng is far higher than the stadiums the players usually compete in. In a feature article, Steve Haake and Simon Choppin explore the effect of altitude not only on the players themselves, but also on the flight of the ball.