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TIL - 6 lenses were specially designed for the mission to the moon that were capable of photographing in the extreme low-light conditions of space, but 3 more of the same lens were sold to Stanley Kubrick for his candlelit film, Barry Lyndon. The owner of the lens company made one more for himself.

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4XXjN TIL during the division of Berlin, there were still several West Berlin subway lines which passed through parts of East Berlin. They just didn't stop there, leaving behind heavily guarded "ghost stations". Over the years, several citizen of the East managed to get on trains towards the West.
ABQw TIL Scientists once had a favorite curb in Hayward, CA. They studied the curb because it lay on the Hayward fault line & was being pulled apart each year. This evidence of Earth’s shifting plates was observed from the 1970s till 2016 when the city decided to fix the sidewalk & unknowingly ruined it
GYd1Q TIL Earth's largest waterfall is... underwater. In the Denmark Strait, a warm sea collides with a cold sea, pushing the colder water over a very tall ridge — for nearly TWO MILES (3.2km). That's almost 4x longer than the biggest waterfall on land! From the surface, you wouldn't notice at all.
wLEW TIL the leadership of the Communist Party of China are mostly professional engineers, thus China is in fact a Technocracy.
QBnL TIL a group got instructions to sleep as long as they wanted, their cortisol started to rise at 8, and woke up at 9. Another group was said they’d wake up at 6, and their CRH and cortisol rose at 5. Just their expectations of waking time changed the behaviour of stress hormones.