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

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 really affect that…

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