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TIL there's a type of rainbow that's flat called a 'firebow'

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via reddit.com

VB7BG TIL that Mammoth Cave was used as the site of an experimental hospital to treat tuberculosis. 16 patients lived in darkness in buildings constructed underground. 5 patients died and the experiment was ended within 5 months.
aoGA TIL Macchu Picchu was built in 1450, making it far younger than Oxford University, York Minster, The Divine Comedy by Dante and the printing press.
dDB7 TIL There is a camera that allowes you to change focus after the picture is taken.
DQV6Y TIL that in 1962, 90% of Saskatchewan's doctors went on strike
YayG TIL new Google employees are called ‘nooglers’ and are given a propeller beanie cap to wear on their first Friday.