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TIL In the 12th century Chinese Polymath Shen Kuo correctly theorized that rainbows are caused by the refraction of sunlight through water droplets

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e0bM6 TIL Modern sudoku was invented in the United States in the 1970s, became a phenomenon in Japan in the 1980s, but didn't appear in a U.S. newspaper until 2004
5Vgxp TIL that Ocean Sunfish are the heaviest bony fish in the world. The heaviest has been recorded at an astonishing 5,100lbs (2,300kg) with an average weight between 545 and 2,205 lbs.
p8ZRb TIL that The Japanese marathon runner Shizo Kanakuri lost consciousness while taking a break during the 1912 Olympic marathon in Stockholm. In 1967 the Swedes invited him to return and finish the race. His final time was 54 years, 8 months, 6 days, 5 hours, 32 minutes and 20.3 seconds.
m1v0x TIL that desert truffles, cousins of the better known European varieties, are associated with lightning. This delicacy grows under the sands of the Middle East and North Africa and frequently appear after thunderstorms which form nitrogen compounds beneficial to the fungus.
ZaOY TIL Neil Patrick Harris enjoys Red Bull so much on and off the set of How I Met Your Mother that he was given a lifetime supply of it and a mini-refrigerator by the company that makes the drink because of the amount of free advertising he has given it.