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TIL that Horatio Alger, whose aspirational and highly popular stories usually featured a poor boy being taken under the wing of an older man, was charged with "the abominable and revolting crime of gross familiarity with boys" as a young minister. He did not contest the charges and left town.

M7KLB TIL that Neapolitan pizza originated in Italy. Since 2004, Neapolitan pizza has been required by Italian law to have wheat flour, flour yeast, peeled tomatoes, mozzarella cheese, sea salt, and olive oil in order to qualify as pizza.
Denr TIL The original script of Braveheart had the Irish fighting the Scottish, which was historically accurate. The script had to be changed because the Irish and Scottish extras refused to fight each other.
9blQ TIL After President Carter retired, he started an effort to eradicate the Guinea Worm, which infected millions of people with worms that slowly and painfully burrow out of the body over 3 months. By 2001, the infection rate was reduced by 98%, with 80% of the remaining cases in the Sudan warzone.
eBVJ TIL a substance called Dioxygen Difluoride (O2F2) is so volatile that it makes almost any organic substance ignite and explode at any temperature hotter than -300°F (-185°C). It can literally set ice on fire
gKw9 TIL of Robert Landsburg, a photographer,who,upon realising he wouldn’t survive the volcanic eruption he was documenting,kept taking photos before putting the film in his bag and lay down on it,in order to protect the shots.The images were recovered and provided invaluable insight.