The psychologist Philip Zimbardo is famous for the classic Stanford Prison Experiment when back in 1971 he turned the university basement into a fake prison where the young men playing the guards soon started abusing the people they were told were their prisoners. He showed how much circumstances can distort individual personalities and how given complete control over others, anyone can act as a monster. Now he’s turned his attention to promoting positive, even heroic behaviour. Through research and education he’s wants young people to believe they are all “ heroes in waiting”. Claudia went to meet Professor Zimbardo in San Francisco and hears from a real, home-grown hero, Andrew Antonio, whose act of heroism helped to save a woman’s life.