UCLA scientists used portions of dinosaur teeth to pin down Tyrannosaurus rex’s temperature for the first time, placing it at 97 degrees Fahrenheit, comparable to a human. A warm-blooded T. rex would have been an energetic predator or scavenger, not a sun-basking slowpoke. UCLA researchers perfected the method of measuring temperature from fossils, and partnered to use T. rex teeth from the Natural History Museum of Los Angeles County.
