Sixty-six million years after the last Tyrannosaurus rex walked the earth, science has finally taken its temperature. By reading the atomic signatures preserved in fossilized tooth enamel, researchers at UCLA have determined that the great predator maintained a core body temperature of roughly 97 degrees Fahrenheit — a figure startlingly close to our own. This quiet number, extracted from stone, reframes how we understand the animal's metabolism, its hunger, and its dominance across the ancient landscapes of North America.