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TIL amidst early concerns about leaded gas, the engineer who discovered tetraethyllead as an additive demonstrated its 'safety' by pouring it over his hands and inhaling its vapor, stating he could do this every day without issue. He later took a leave of absence due to lead poisoning.

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Wkn0X TIL that the iconic "DUN DUN DUN-DUN DUN DUN" hook in the Mission Impossible theme song was inspired by the Morse code sound for the movie's initials "MI" which is --.. or "dash-dash, dot-dot".
v1LwD TIL that Paris only has one sister city, Rome, as it is seen as the only city worthy of being twinned
jDBj TIL that despite being an icon of fiscal conservatism, Ronald Reagan actually tripled the Gross Federal Debt, from $900 billion to $2.7 trillion during his administration.
GAWr5 TIL that the USA uses 10x as much salt on the road than they do in processed foods, and was first introduced on the roads in New Hampshire.
QJ5pk TIL until about the ninth week of gestational age the external genitalia of males and females look the same. After this stage, the what ends up being the scrotum raphe (the vertical line on the scrotum on males) grows from the labioscrotal folds which grow in to the labia on females