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Tyrannosaurus rex. >> probably 66.5 million years old, something like that. this is a big dinosaur. this is one of the biggest. >> reporter: a dinosaur thats tentatively been sold already to a museum. we dont know the price, but what we do know is overall, prices for dinosaurs shifted seismically with the discovery of the largest t-rex fossil ever found named sue. >> it changed my entire life, my entire focus in science and changed our business, changed everything. >> reporter: larson and his bl...