Fossil Detective work on the end of the Dinosaurs

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Fossil detective work on the mass extinction that included the dinosaurs – was it caused by CO2 released by massive volcanic activitity or a meteorite? How the bottom of Antarctica's giant coastal ice-sheets is melting faster than suspected. Balloonists aim to reach a record altitude of 40,000 metres. Making space for honey-bees can boost yields for coffee-growers by 50%.