The tyrannical lizard T. rex may have been heftier than thought, according to new weight measurements that show at least one individual tipped the scales at more than 9 tons.Full story
It's been a decade since The Field Museum in Chicago unveiled "Sue," the largest and most complete T. rex skeleton in the world. Now, the "King of the Dinosaurs" is more interactive than ever. NBC's Leo Juarez reports.
A new study of the T. rex's muscular tail suggests he was one of the world's fastest hunters.