Evidence of a green Sahara

Sereno shows his discovery
University of Chicago paleontologist Paul Sereno displays a model of the head of Rugops primus wrinkle-faced meat-eating dinosaur June 1, 2004 at the Garfield Park Conservatory in Chicago, Illinois. Serano led a team which discovered the 95 million-year-old fossil in Africa.
Scott Olson/Getty Images

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