Stephen Sackur talks to newsmakers and personalities from across the globe. Plenty of Hollywood's female stars have railed against the obsession with youth and beauty, but Charlize Theron refuses to let her work be defined by either. She won an Oscar playing a ruthless serial killer, and recently has become a UN goodwill ambassador, raising awareness about violence against women. She continues to play complex women confronting their inner demons. Is that a coincidence, or part of who she is?