Paleontologists have found the 370 million-year-old fossil of a predatory shark with rotating teeth. This Paleozoic shark was only about 33 cm long and had a short triangular snout, but it possessed unusually large eyes, accounting for 30 percent of the total length of the cerebral cortex. Because the fossil function is very well preserved, researchers can scan it with a computerized tomography method, and then build a digital model in 3D to conduct the mechanical tests.
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