› added 2 weeks ago

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TIL during World War II, the British Secret Service created a special playing card deck for POWs that, when soaked in water, revealed hidden escape routes and maps. When dampened, the cards would separate to expose complete maps of prison camps and surrounding territories.

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via reddit.com

8Y4P TIL Everest is not the furthest point from the Earth’s center. It’s a volcano in Ecuador called Chimborazo due the Earth being wider at the equator.
KYg5R TIL that both Thomas Jefferson and John Adams, two of the Founding Fathers of the United States and later Presidents, died on the same day: July 4, 1826, exactly 50 years after the signing of the Declaration of Independence.
vPm64 TIL that a baby still in the womb received heart surgery to remove a tumor
brg9 TIL there’s a water slide in Germany which is so intense, that women are banned from riding it
X0oKE TIL about a cheeky species of New Zealand parrot that required their own special playground be made to keep them from messing with traffic