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TIL There is a gene mutation which gives almost complete protection against HIV. 1% of Caucasians have the mutation, but among the Ashkenazi Jews of Eastern Europe, the rate is as high as 15%.

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a8wbN TIL there is a childhood onset Alzheimer's Syndrome called San Filippo Syndrome
KOjxa TIL reflector (or reflex) sights have been used in some degree on weapons for just over 100 years
ZpagG TIL the owner of the domain milk.com has owned it since 1994 and uses it as a personal blogging space. He’s refused to sell it and even justified his choice on the site.
vJwx TIL: Jackie Gleason once was an actual pool shark. He made all his own trick shots in The Hustler (1961).
NEME TIL U.S. President Andrew Jackson once held an open house party at the White House at which he served a 1,400-pound (640 kg) block of cheddar cheese.