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TIL Portugal produces more than 50% of the world's cork supply.

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ANX7d TIL of chiengora, a luxury wool made out of dog's hair. It's up to 80% warmer than regular sheep's wool
Y41W TIL in 1964 the FAA, wanting to find out whether the population of a city would tolerate regular sonic booms, got the air force to make multiple daily supersonic flights over Oklahoma City for six months
WK84 TIL Pemba Dorje climbed Mount Everest in just 8 hours and 10 minutes. This is the fastest ascent from the south base camp. He did this after a losing a bitter dispute with Lakpa Gelu Sherpa who set the previous record.
1ajAO TIL that the Empire State Building's opening coincided with the Great Depression in the United States, and as a result much of its office space was vacant from its opening. The lack of renters led New Yorkers to deride the building as the "Empty State Building".
D1vJv TIL couples can become external regulators for one another, essentially functioning as a mutual bio-feedback system. Their pupils dilate in synchrony, they echo one another's speech patterns, movements, and even cardiac and EEG rhythms.