Doomsday for the Dinosaurs

Sixty-five million years ago, scientists believe, an asteroid smashed into the earth, ending the reign of the dinosaurs. Disastrous as it was, scientists have nevertheless found it difficult to explain how the asteroid impact could have killed plant and animal life on the other side of the planet. Kevin Baines of the Jet Propulsion Laboratory believes he may have found the answer in Mexico's Yucatan peninsula.

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