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TIL the upper atmosphere of Saturn’s (and other gas giants presumably) poles are heated by the massive Auroras happening there!

Read more nasa.gov

via reddit.com

mxypE TIL that there are many scientific names for water such as dihydrogen monoxide (subject of a famous hoax), oxidane, hydrohydroxic acid, hydric acid, hydrogen oxide, hydrol, and hydrogen hydroxide. Most of these names are not widely used, but are technically correct.
VBAjp TIL Blade Runner 2049 was not the first sequel to Blade Runner. Prior to this film, a 1998 box office bomb called Soldier was produced with the intention of being the sequel. Props from Blade Runner were used even though Soldier's script had gone unproduced for over 15 years before filming began.
697nX TIL cigarette smoking causes certain drugs to be metabolized faster, including caffeine. Heavy smokers need to drink up to 4 times as much caffeine to have the same effect as a non-smoker.
pYyw4 TIL in 1862 John Langdon Down was the first to describe a distinct mental disability, calling it "Mongolism" due to his perception that children with it shared facial similarities. Now called Down Syndrome, was discovered in the 1950s to be caused by the presence a third copy of chromosome 21.
KnoG TIL in 1990 soul legend Curtis Mayfield was paralyzed from the neck down by falling lighting equipment whilst performing in New York. He continued to compose and record vocals lying down until his death in 1999.