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A paper lock kept secret letters safe from prying eyes
Fun facts
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?
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13 April 2026
Monarch butterflies migrate along a route they've never seen before.
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