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Calling someone the "salt of the earth" is a compliment for a reason. Salt has been an immensely important and coveted substance throughout history. It's so universally valuable that it has even served as currency and is the origin of the word "salary." The control over salt has sparked both economic growth and instigated wars throughout the world. The more you learn about salt, the more you'll appreciate that shaker on your kitchen table. Take our quiz to see if you're worth your salt.