Researchers Calculate 2.5 Billion T-Rex Lived on Planet Earth
Side view of the completed exhibit installation of the fossil skeleton of Sue, a Tyrannosaurus Rex, seen in a darkened Stanley Field Hall at the Field Museum, Chicago, Illinois, June 15, 2000. (Photo by Mark Widhalm/Field Museum Library/Getty Images)

Researchers Calculate 2.5 Billion T-Rex Lived on Planet Earth

BY MICHAEL QUIRK Sometimes quantity matters more than anything. If you have one exam in school this week, that is manageable. If you have 14, that's ulcer-inducing. Sometimes quantities don't…

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