T. Rex Gets A Makeover

A study of the running ability of Tyrannosaurus Rex, reported last week in the journal Nature, suggests that the king of the prehistoric jungle wasn't quite the speedster we once thought. Researchers found that T. rex (as imagined in an early 20th century painting, left, by Charles Knight) was too massive to sprint like the giant-size cheetah it appears to be in movies. This is just the latest in a series of humbling revisions made over the past decade or so, as new fossils were unearthed and old ones re-examined. But one thing hasn't changed: this 42-ft.-long, 14,000-lb. toothy predator would...

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