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TIL a 32 year long study found that obesity spread through social connections, and that a person’s chances of becoming obese increased by 57% if he or she had a friend who became obese

Read more nejm.org

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KY8b9 TIL that Persian and Farsi are just different names for the same language
Z8aMo TIL the world’s oldest tree, the world’s tallest tree, and the world’s largest tree are all located within California, a state that makes up less than 0.3% of the world’s total landmass.
788kP TIL during WWI, President Wilson recruited "Four Minute Men" - 75,000 volunteers gave 4-minute public speeches nationwide to encourage patriotism and participation in the war effort. An estimated 7.5 million talks were given to 300+ million listeners (in a nation of 103 million) in just 18 months.
nePYB TIL the term "out of the blue" originates from lightning strikes out of the clear blue sky.
BgK5K TIL that "slash fanfction" predates the internet, originating in the 1960 with "Kirk/Spock" in the Star Trek fandom.