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TIL that the notch in the heel of men’s dress shoes is to prevent your heel from getting caught on your pants’ cuffs. It’s called the ‘Gentleman’s Notch’.

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W7kgo TIL Pope Gregory XVI opposed gas lighting and railways, believing that they would create commerce and lead to liberal reforms. Gregory XVI in fact banned railways in the Papal States, calling them chemins d'enfer ("road to hell", a play on the French for railroad, chemin de fer, "iron road")
X7dP TIL that air pollution in China increases snowfall in California.
W8Go TIL A UK university was fine £400,000 after 2 students were accidentally given a lethal dose of caffeine during a scientific experiment. Because of a misplaced decimal point on the phone used to calculate the caffeine dosage, they received 30g instead of the planned 0.3g. The lethal dose is 18g.
60G7 TIL: If someone reports their company for tax evasion in the U.S., he or she will receive 15% to 30% of the amount collected.
78nZx TIL of HEXAGON, a spy satellite used by the USA during the 1960s that captured several miles of film at a time, airdropping them into the ocean for recovery