When Zinedine Zidane, the then French captain, headbutted Italy’s Marco Materazzi during the 2006 World Cup final, the clash quickly became one of the most infamous incidents in football history. What was not clear was what sparked the Frenchman’s ire – Zidane said his mother had been insulted, a charge that Materazzi vigorously denied.
Image: Dr Helen Bear has developed technology at the University of East Anglia to read people’s lips. Photograph: Martin Pope for the Guardian
