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CODES: Keeping Secrets Secret

Psssrt. Got a secret?

Want to keep it from your little brother or sister? Need to pass along some information to a friend without the whole world finding out? Well, you're in good company-with kings and generals and spies. Read on to learn some of their cleverest methods for keeping secrets secret.

How do you keep a secret if you're a king or somebody important and you know everyone would love to read your messages? Well, first you might try to hide them in some supersecret way. A Greek ruler once wrote his secret message on the shaved head of his slave. The message was hidden as the slave's hair grew back, and the slave only had to shave his head to deliver it. The ancient Chinese wrote ...

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