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TIL that Al-Qaeda were surprised by the collapse of the Twin Towers. Among those planning the attacks, Osama Bin Laden had been the most "optimistic", due to his experience in engineering, and had predicted that the fire would collapse the area where the planes hit and all the floors above only

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4d1b TIL that an invention called the Radiovota would have essentially allowed 1930’s radio listeners to up-/downvote broadcasts.
EoZx TIL: The American Lung Association states that,“In fact, when equal amounts of marijuana and tobacco are smoked, marijuana deposits four times as much tar into the lungs. This is because marijuana joints are un-filtered and often more deeply inhaled than cigarettes.”
GYZmG TIL Michigan has a bottle deposit of 10 cents, instead of the usual 5 cents. Their recycle rate is 97%, compared to 70% of states with bottle deposits, compared to 33% for states without any deposit laws
4krxo TIL from 1066 to 1971 in England a pound was worth 20 shillings, each worth 12 pennies, each worth 2 halfpennies, each worth 2 farthings, plus thruppence, sixpence, florin, half crown, and crown
dLZ8 TIL Helsinki, Finland has an annual celebration called Dinner Under the Sky, where all Helsinkians can set up a table outside and enjoy their dinner on the city’s sidewalks, parks, or even in the middle of the busiest shopping streets.