New Mexico Museum of Natural History and Science paleontology curator Thomas Williamson talks about the results of neutron and X-ray scans of a fossilized tyrannosaur skull during a news conference at the museum in Albuquerque, N.M., on Tuesday, Aug. 15, 2017. Williamson discovered the fossil remains of the "Bisti Beast" in 1996 and worked with researchers at Los Alamos National Laboratory last fall to scan the skull in hopes of gleaning new information about the evolution of the massive, bone-crushing dinosaurs. (AP Photo/Susan Montoya Bryan)
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