NewScientist: Dom Cobb (Leonardo DiCaprio) is a dream snatcher. He's an industrial spy, who steals secrets when his victims are at their most defenceless: when they are asleep, and dreaming. But he has an even rarer ability, that of inception. He can plant an idea in someone's sleeping mind, and watch it grow and take root in reality. "The most resilient parasite is an idea," he says.