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TIL the Boeing 747 can carry an extra engine on its wing. Airlines used to use this capability regularly, when engines were less reliable, to deliver replacements to their stranded planes.

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e0AD4 TIL That Dungeons and Dragons' "Thieves' Cant" is a real thing - a language used by beggars and thieves in medieval Britain.
PYEoE TIL the musical Hamilton has over 20,000 words, and would take 4-6 hours to perform if songs were sung at traditional musical paces
d8lOK TIL Courtroom drawing as we know it in the United States was born in response to the 1935 media circus over the kidnapping and killing of aviator Charles Lindbergh’s infant son. The American Bar Association put forth a ban on cameras—leaving news outlets to seek alternate means of coverage.
Lk4Nr TIL that there is a rare condition called tetrachromacy, which allows some people, mostly women, to see 100 million different colors, due to having four color receptors. This is far more than the 1 million shades normal people can see with their 3 color receptors.
yyDp TIL llamas are born with an extra pair of fighting teeth that they use to bite off other males’ testicles, making them the only fertile male in the group.