This Week: Drilling Deep for What Doomed the Dinosaurs

Later this month, scientists will board a drilling ship and set sail for the Caribbean basin, just off Mexico's Yucatan Peninsula. They'll be drilling a kilometre-and-a-half into the sea floor, in an attempt to better understand the last great global extinction event. Their objective is the Chicxulub impact crater, created 66 million years ago, when the Earth was struck by a giant asteroid from space. The impact set off a massive global extinction that wiped out the dinosaurs. We'll speak to the lead scientist on the expedition, who hopes to gain new insights into the extinction, and how life recovered afterwards.

Plus - the world's oldest land fossil; and how our brains are made for music.

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