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TIL: clouds are 99.9999% air and only 0.0001% water by volume, even though they can weigh thousands of tons.

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awKk9 TIL that in 1843, when Oliver Wendell Holmes Sr. correctly concluded that "childbed fever" was transmitted between patients by germs on doctors' hands, he was ridiculed. Sir Frederick Treves compared a doctor washing his hands to an executioner manicuring his nails before an execution.
xPa5 TIL In the US, people can be rejected from joining the police force if they are too intelligent.
vPE1B TIL that in the middle ages, men who wanted a boy sometimes had their left testicle removed as they believed that the left testicle produce "girl" sperm and the right testicle produce "boy" sperm
n1jY TIL the primary reason why Ikea furniture is so inexpensive is its efficiency in packaging. Their chief goal in design is to figure out how to pack their furniture into a compact space and put more of them on each pallet.
KVBG TIL of a WWII war crime committed by a US bomber against a German U-boat rescuing allied civilians. It has been suppressed by the US and Germany alike, in Germany because it paints Nazis in a positive light.