Have you ever wondered what the button on the top of your baseball cap is for? Or maybe you know the true purpose of the high-heeled shoes? Back in the 10th century, they prevented riders' feet from constantly falling out of the stirrups. And in Ancient Rome, salt was so precious that people even called it white gold. Some things you use, wear, or eat every day, are more interesting than they might seem as they have their own secrets and hidden purposes. 

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