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TIL the phrase being on "cloud nine" actually comes from a cloud atlas published in 1896 that divides clouds into 10 basic types, the ninth type being cumulonimbus clouds, the most puffy-looking ones. See A Short History of Nearly Everything by Bill Bryson, Part V Chapter 17 Into the Troposphere.

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oBxoL TIL that Iceland is essentially free of mosquitoes
areN TIL in 2007, a 75 year old woman smashed up a Comcast office with a hammer because she was fed up with their poor customer service.
x6dD TIL The cymbal manufacturer Zildjian was founded in Istanbul nearly 400 years ago
wL5KJ Historical photos show fishermen with chinooks almost as tall as they are. A century's worth of dam-building, overfishing, habitat loss and hatcheries has cut the size of the average fish in half.
Oo5ka TIL A key symptom of depression is anhedonia, typically defined as the loss of ability to experience pleasure. It is a core feature of depression, but it is also one of the most treatment-resistant symptoms. Using ketomine, researchers found over-activity in the brain blunting reward seeking