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TIL when all remaining California condors were captured to ensure their survival, they were de-loused. In doing so, conservationists killed all remaining individuals of a species of louse (Colpocephalum californici) that lived exclusively on the California condor, inadvertantly causing an extinction

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5YE4k TIL of the chariot race sequence in Ben-Hur (1959): the set was the largest ever built at the time and took over a year and thousands of workers to build; the director's son, a stuntman, almost died; the extras rioted on camera; and the cars filming the race were slower than the horses
aaQo TIL that a Tokyo-based company invented an in-office machine which turns used copier paper into toilet paper rolls, right in the office.
78PW7 [TIL] Mexican Heather is a real crowd-pleaser when it comes to attracting pollinators. Its bright, colorful flowers are like a beacon for bees, butterflies, and hummingbirds.
p8aVQ TIL after a Japanese Destroyer rammed the ship Naval Lieutenant John F. Kennedy was on during WW2, Kennedy swam for 5 hours towards an island while towing one of his badly burned crewman by clasping a scrap of the crewman's lifejacket between his teeth despite sustaining a back injury from the crash
MYy0 TIL that most muppets are left handed due to the majority of muppeteers being right handed and preferring to control the head with their dominant hand.