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TIL there is a theory that some of the Black Death was not bubonic plague, but a variant of a haemoratic fever. Those who survived may have passed this immunity through genetics which may account for the percentage of individuals who are immune to AIDS.

Read more pubmed.ncbi.nlm.nih.gov

via reddit.com

VMd54 TIL that Walter Morrison, the Inventor of Frisbee was turned into a Frisbee after he died.
b6JG4 TIL- You can get a "Christmas Tree Permit" for White Mountain National Forest in New Hampshire to Clark Griswold your own perfect tree
v1gWx TIL that Alfred Hitchcock was known to play elaborate pranks on his colleagues. One night he hosted a dinner party and dyed all the dishes blue because "there aren't enough blue foods."
g4JD TIL that after the death of Ludvig Nobel, brother of Alfred Nobel the inventor of the dynamite, a French newpaper mistook him for his brother and wrote a scathing obituary for Alfred Nobel. This caused Alfred to consider his legacy and caused him to create what today we call the Nobel Prize.
WL68 TIL Teddy Roosevelt was involved in a bar fight, which began after a man bullied him for wearing glasses. Teddy, being an experienced boxer, knocked the man out cold after one punch.