The World Cup was lit up with Robin van Persie's brilliant flying-header goal against Spain. It was a splendid goal as the Manchester United striker leapt in the air and headed it over the keeper who just stood and watched the ball sail over his head. The question is, from where did van Persie learn the art of the flying header. Well, we've got the secret unraveled. It's from his former boss, Arsene Wenger.