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TIL The first known evidence of the use of cryptography (in some form) was found in an inscription carved around 1900 BC, in the main chamber of the tomb of the nobleman Khnumhotep II, in Egypt. The scribe used some unusual hieroglyphic symbols here and there in place of more ordinary ones.

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nOmP TIL all provinces in Canada have banned expiry dates on gift certificates
awmVA TIL that Cambodia is the only country in the world to have a real building on its flag. Angkor Wat, a Hindu-Budist temple, has become a symbol of Cambodia, which appears on its national flag, and it is the country's prime attraction for visitors.
d86oQ TIL A "cobble" is an actual size of rock, defined on the Udden–Wentworth scale as between 64–256 millimeters (2.5–10.1 in), larger than a pebble and smaller than a boulder.
v1Py8 TIL that the Vjosa river is the last untamed river in Europe
yewv TIL an officer of the US Navy, James Stockdale, became a POW. To prevent his captors from using him as propaganda, he cut his scalp with razors, beat his face with a stool until he was unrecognizable, and slit his wrists.