Remember that great big meteor that exploded over the Ural Mountains in Russia? Y'know, the one that was all over the news? Well, Channel 4 are all over it and they've made a documentary showing previously unseen footage of the carnage. It's a bit like Deep Impact, except it's , well, y'know, real? We wouldn't advise watching this if you're one for worst case scenarios: Nasa will be putting ideas in your head by telling you how they plan to defend the earth in the event of a real catastrophe. You won't want to close your eyes...