Once upon a time, the ocean teemed with enormous sharks that were far bigger than the dinky one in Jaws — ten times the size of a T-Rex , by one estimate.

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Scientists call these long-extinct creatures “megalodons,” a name that rightly translates to “big tooth.” Of all the megalodon’s impressively enormous features, the mouth-area stands out. Its jaws applied enough pressure to crush a car. Its mouth opened wide enough to swallow a train.

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Scientists know all of that primarily from the megalodon’s enormous fossilized teeth, some of which are more than seven inches long and, once you start looking for them, crop up frequently. They’ve been unearthed everywhere except Antarctica , and they’re for sale on eBay (not that we recommend purchasing them there). You can also find them in various K-12 classrooms, menacingly bared in floor-to-ceiling jaws. The school ones aren’t really fossils, though — they’re […]

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