Sixty-six million years after the largest Tyrannosaurus rex ever found drew its last breath in what is now Saskatchewan, modern physics has reached back through deep time to read the final chapter written in its bones. Using neutron imaging — a technique that measures how materials absorb and scatter subatomic particles — researchers discovered preserved soft tissue inside a healing rib wound on the fossil known as Scotty, evidence that the animal's body was actively repairing itself when death arrived. The finding is rare not only for what it reveals about one creature's final days, but for w