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TIL there are 78,000 people in the "Unorganized Borough" of Alaska, which has an area of 323,440 sq mi (still larger than Texas the second biggest state). This is equivalent in population to Chelan County, Washington, or one-twentieth of Manhattan, less than one square mile.

69PBZ TIL The longest reverb in the world occurs in the bombproof Inchintown fuel tank built in the late 1930s/early 1940s in Invergordon, Ross-shire, Scotland. It lasts for approximately 112 seconds.
yQvZw TIL Donkeys are used to fend off coyotes and other predators, are very smart, and typically become the alpha in a team of horses. They have a great sense of fight or flight and other horses will gauge their reaction by watching the donkey’s behavior.
m1WGo TIL that the forerunner of the bicycle, the Dandy horse, was invented largely as a result of the climatic changes brought about in Europe by the explosion of Mount Tambora (1815), which widespread crop failures which have led to the deaths of thousands of horses, means of transport at the time.
WkGY4 TIL that sponges are living animals and were the first animals to diverge from the evolutionary tree from all animals' common ancestor, making them the sister group of all other animals.
avXN TIL that during US-backed Pinochet’s violent takeover of Chile, a popular singer was beaten, tortured and had his hands broken. While he lay on the ground, his captors mockingly suggested he play guitar. With that he sang “We Will Win” before he was shot 44 times.