How did X come to mean "The UNKNOWN"?

A truly X-cellent and X-ceptional video… ↓↓↓ More info and sources below ↓↓↓ Despite being one of the rarest letters in English, the letter X is everywhere. We sign letters with it, we rate movies with it, we name all sorts of things after it. We’re kind of obsessed with it. And that’s probably all...

12 min - Science & Tech - Be Smart

Read Deeper: Science & Tech

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