AS PAUL SERENO SCANNED THE VALley in southeast Morocco last July, he spied a reddish patch high on a cliff. Its color left no doubt that it was sandstone, which preserves fossils as well as anything ...
Tyrannosaurus rex was the undisputed giant of all land predators for 90 years, and in that time it developed the aura of a dinosaurian Muhammad Ali. It was, truly, the greatest. But in 1995 ...
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