Why did T. rex have tiny arms? A new study may finally have the answer

By Jacopo Prisco, CNN (CNN) — Scientists may have finally solved the riddle of Tyrannosaurus rex’s small arms, which have always stood out as the oddest feature in the mightiest of dinosaurs, prompting jokes and a century-plus debate on their purpose and evolutionary history. At about 3 feet long, the arms of T. rex were