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Taste isn't the only stimulus to over-eating – how the drive to eat more than we need is stronger and more complicated than previously thought. Politics of space exploration in the run-up to the US presidential elections. Gathering atmospheric data in Antarctica by balloon. The carbon dioxide monitoring programme begun 50 years ago and the resulting Keeling Curve that convinced many of global warming. Plus, a project to tag and monitor sharks by satellite to find out where they acutally go, the Amphibian Ark at London Zoo and research into the deadly chytrid fungus.