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TIL that Alzheimer’s disease can be caused by a brain immune response to herpes infection. This theory dates to the early 1900s, but was ignored because the scientist was Jewish, while Alzheimer, who named the disease, was German.

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LkpVm TIL despite smoking being illegal on commercial planes, they are required by the FAA to have ashtrays in the lavatories so that in case someone breaks the law and smokes there is a place to safely extinguish the cigarette.
vg57 TIL ancient Rome’s toilets were not hooked up to the extensive sewer system but into nearby open cesspits
k7bd TIL: In Biertan village in Transylvania Romania, the church had a “divorce/reconciliation room”: Couples that wanted to break up had to live two weeks in a room with one small bed, one table with one chair, one spoon, one plate. In 300 years they had just one divorce.
EGwW TIL In 1974 sociologist Phillip Kunz sent 600 Christmas cards randomly to people he didn’t know. He got more then 200 replies, including people sending pics of their families, diplomas and new homes.
R5gRa TIL: The first written use of the name "Jessica" appears in Shakespeare's The Merchant of Venice. The bard likely changed (anglicised) the spelling from the biblical name "Iscah"