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Scientists Find 66-Million-Year-Old Blood Vessels Inside T-Rex Bones

Scientists have discovered remarkably preserved ancient blood vessels hidden inside fossilized dinosaur bones, including a Tyrannosaurus rex specimen whose bone had fractured and begun healing 66 million years ago. Using advanced imaging techniques that allow researchers to peer inside fossil bones without breaking them, the team found structures that were long thought impossible to survive the fossilization process. The discovery fundamentally changes our understanding of how fossils can preserve delicate biological structures over tens of millions of years.