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TIL having an O blood type makes you twice as likely to attract mosquitoes than people with A blood type. B blood types fall in the middle of the spectrum.

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LkaEv TIL the Koh-i-Noor is one of the largest cut diamonds in the world at 105.6 carats and part of the Britain Crown Jewels. It used to weigh 191 carats but it failed to impress viewers in Britain. In 1852 Prince Albert ordered it to be cut. The significant amount of weight loss was due to flaws found.
BrGeb TIL The band Kiss makes Kiss Kaskets and Dimebag Darrell was buried in one.
9YMyX TIL that the US had a lesbian First Lady in 1885-1886. She was Rose Cleveland--Grover Cleveland's youngest sister and Acting US First Lady before Grover married in 1886. She was also a lesbian & had a relationship with a wealthy widow, Evangeline Marrs Simpson, with explicitly erotic correspondence.
grvmy TIL the Swedish military goes by mission command rather than chain of command. Meaning orders & rules can be ignored if they interfere with objectives. This led to some friction in Bosnia as Nordbat 2 would ignore UNs rules of engagement to obtain the primary objective of preserving civilian lives.
pY8nZ TIL: The Beaver magazine had to change name, because its unintended sexual connotation has caused the history journal to become snagged in Internet filters and has turned off potential readers