Instead of bones, sharks have a skeleton made from cartilage.

The Boston University Bridge (on Commonwealth Avenue, Boston, Massachusetts) is one of the few places in the world where a boat can sail under a train driving under a car driving under an airplane.

Tycho Brahe, a 16th century astronomer, lost his nose in a duel with one of his students over a mathematical computation. He wore a silver replacement nose for the rest of his life.

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