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TIL that during the war, Vietnamese children thought the American soldiers were blind because they had blue eyes and wore sunglasses all the time.

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MedWV TIL that a lasagna can act like a battery, when stored in certain conditions. In a "Lasagna Cell", a steel pan acts as the cathode and an aluminum foil covering as the anode. The foil can get corroded away and form holes where it touches the top of the lasagna.
VMMrG TIL Hollywood briefly experimented with an interactive movie format akin to "Choose Your Own Adventure" books. Back to the Future co-writer Bob Gale wrote a film and directed a film called "Mr. Payback" in which audience members were able to choose what happened next. The results were disastrous.
OooKL TIL that Eli Whitney, inventor of the cotton gin, was white
wLGnY TIL that when wooly mammoths went extinct, their territorial grassland was replaced with birch forests. This ushered in an age of forest fires so significant that it may have changed the global climate.
9YLDB TIL The modern “Western” depiction of Santa Claus can be traced back to a 1931 Coca-Cola advertising campaign.