If Megalodon sharks were still alive today, they would be a breathtaking sight. They were the largest sharks ever — up to three times longer and thirty times heavier than today’s great white sharks. Or as a shark scientist quoted by National Geographic put it, “A great white is about the size of the clasper, or penis, of a male Megalodon.” Their teeth averaged 3 to 5 inches — and were sometimes more than 7 inches long....

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