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RENO, Nev. (AP) - A geologist who proposed the theory that a comet or asteroid smashed into the Earth and killed off the dinosaurs is the winner of a top research award.
Walter Alvarez, a geologist at the University of California-Berkeley, is the 19th recipient of the nonprofit Desert Research Institute's silver medallion and its $20,000 prize. He was to accept the award on Monday.
Alvarez's nearly two decade-long investigation produced an uncommon scientific drama of personal tenacity and ingenuity, said Stephen G. Wells, president of the institute.
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