Sixty-six million years after its last breath, the Tyrannosaurus rex has yielded one of its most intimate secrets: a body temperature of roughly 97 degrees Fahrenheit, indistinguishable from our own. Scientists achieved this by reading the isotopic memory locked inside fossilized teeth, transforming ancient mineral into biological testimony. The finding places T. rex unmistakably among the warm-blooded — creatures that carry their own heat, sustain their own fire — and asks us to reconsider what it truly means to be a predator built for endurance rather than mere spectacle.