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TIME's The Brief TIMEnewsbrief

What Made T. Rex Teeth So Deadly

Researchers have found that the saw-like internal tooth structure of carnivorous dinosaurs like the Tyrannosaurus Rex may have played an important role in their success as predators. http://goo.gl/w6ewAU More From The Brief: time.com/newsletter/the-brief #FullNewsAudioAvailable

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