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 Scientists in England, analyzing the 163-million-year-old tracks of a large theropod dinosaur in limestone quarry near Oxford, have discovered that this two-footed beast could really turn on the speed, going from 4 miles per hour to 18 in a few strides. This findings, reported in the journal Nature, are rare evidence that large thropods―of which Tyrannosaurus rex is the most famous―were capable of running.