Taxi from Another PlanetInsightful, good humoured essays on the possibilities of alien life and the uses of space exploration, based on an astrobiologist's everyday conversations with his fellow humanstaxi drivers, to be precise. If you've ever sat in the back seat of a taxi, you know that cabbies like to talk. Sports or politics, your job or theirs, taxi drivers are fine conversationalists on just about any topic. And when the passenger is astrobiologist Charles Cockell,