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A paper lock kept secret letters safe from prying eyes
Fact of the week
15 April 2024
A paper lock kept secret letters safe from prying eyes
Imagine it's the late 16th century. You're an English spy in Venice, and you have a secret message for the Queen. It will take weeks for a letter to reach London by sea and land. Sealed envelopes don't exist yet. So, how can you be sure no one will read your message before it arrives?
Find out more in:
100 Things to Know About the Unknown
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