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TIL the small cylindrical bulge at the end of laptop charger is an electrical device that helps to isolate the laptop from electromagnetic noise.

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jNVdX TIL the title of the movie 'October Sky' is an anagram of 'Rocket Boys', the title of the 1998 book upon which the movie is based. Universal Studios marketing people had to change the title because, according to their research, women over thirty would never see a movie titled Rocket Boys.
kweW TIL Building a Toyota Prius is worse on the environment than building a regular car, due to mining of rare earth metals.
g5R7 TIL Until the late 1400s the word ‘girl’ just meant a child of either sex. If you had to differentiate between them, male children were referred to as 'knave girls’ and females were 'gay girls’. Equally, a boy could be called a 'knave child’ and a girl a 'maiden child’.
W7JLo TIL that Mae Jemison, the first African-American woman in Space, was so inspired by Nichelle Nichols' portrayal of Lieutenant Uhura on Stark Trek that she began every shift of her 1992 Shuttle mission by radioing "Hailing Frequencies Open" as a tribute to the actress and her character.
GAPv7 TIL about the Ainu, the original indigenous inhabitants of Japan