Sixty-six million years after the largest Tyrannosaurus rex ever discovered drew its last breath in a Saskatchewan wetland, science has finally read the story written in its bones. A physicist, not a paleontologist, led the inquiry — using neutron imaging at Oak Ridge National Laboratory to peer inside fossilized ribs without disturbing them, revealing that Scotty died from a rib fracture sustained in combat that never had the chance to heal. The discovery is as much about method as it is about the animal: a non-destructive technique now opens the fossil record to questions that once required