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TIL that modern windows are usually made from float glass which is a sheet of glass made by floating molten glass on a bed of molten metal of a low melting point, typically tin. This method was pioneered in the 1950’s by Sir Alastair Pilkington and Kenneth Bickerstaff.

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5V7AB TIL of a Morganatic marriage (Left-handed Marriage) where persons of different classes marry and the benefits of the higher class spouse are not passed on to the children. For example, if a King marries lower class royalty his children can not become the King/Queen.
6E1mX TIL a Russian Blue tomcat named "Xiaopi" needed a glucose drip after mating with five females during one night in a Chinese pet hotel. The cat's owner, Mr. Zhao, said he specifically told the hotel that Xiaopi wasn't neutered, but they let him roam freely anyway.
GZPQ TIL Most bats cannot take off from the ground. They spend their entire lives flying or upside down.
xV86B TIL that average millionaire went bankrupt at least 3.5 times
MeeX8 TIL that Roman Emperor Valentian I died of a brain aneurysm in 375 because he became so enraged at a group of envoys. He reportedly became so angered that he burst a blood-vessel in his skull, leading to a stroke that ended his life.