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TIL about the Storegga Slide. In about 6200BCE, structural failures in the Norwegian continental shelf triggered submarine landslides with 3500km³ of debris, causing extreme tsunamis in the North Sea. A similar event today would be catastrophic for many coastal cities of Britain and mainland Europe.

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D81g TIL that prairie dogs have a complex language in which they can describe the size and shape of a human, the color of clothes the human is wearing, and even whether the human has a gun.
d8Y9 TIL The highly classified Task Force Black removed or killed 3,500 insurgents from the streets of Baghdad, reducing bombings from 150 per month to about 2 per month.
0npR TIL if you tie a plastic bag around leaves on a tree you’ll get enough drinkable water to keep you from dehydration
GAmPQ TIL that modern-day Amman, Jordan was once called Philadelphia, and this version of "Philadelphia" referred to the incestuous Ptolemy II Philadelphus who conquered the city
8aeWX TIL about the Batavia mutiny. The 340 survivors of a wreck were stranded on an island off the coast of Australia. A pharmacist leading the survivors had dozens massacred and by the time rescue arrived, there had been a battle for a makeshift fort built by survivors and over 100 people were dead