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TIL about the ‘Doppler effect’ which explains why a siren's pitch changes as it passes by

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xpDo TIL that trial by combat is still technically legal in the United States.
xpmD TIL Travis Kalanick, billionaire founder and CEO of Uber, is the #2 ranked Wii Tennis player in the world
dDyOZ TIL that the British Library has been crippled since last October by a cyberattack and it’s digital collections and services are still offline
KYvVG TIL Benjamin Franklin is frequently quoted as the author, but he never said "Democracy can only exist until the majority discovers it can vote itself largess out of the public treasury."; that is a misquote of a scottish monarchist who hated democracy
AyEn TIL that mathematician Marina Ratner proved her most influential theorem after she turned 50, defying a common notion that only young mathematicians can do great work