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TIL in 1923, as a result of hyperinflation in Germany, banknotes had lost so much value that they were used as wallpaper.

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b9gRa TIL the Russians founded their own Space Forces in 1992. The branch was united with the Russian Air Force in 2015, because the division was seen as "absolutely obsolete".
m1epy TIL that in 1943, the US government once banned sliced bread in American bakeries and homes to keep the flour costs down and to manage the country's wax supply. The rule was disliked so much no one in the government was willing to confess they had that idea.
bQJQ TIL that the Tiger Beetle can run so fast it can go blind, having to stop whilst chasing prey so that their sight can ‘catch up’
JYynm TIL Vantablack isn't a color but a surface application of nanotubes (Vertically Aligned NanoTube Array) that trap/move photons until they convert to heat - thus creating the "black" color through the absence of light
4XOO6 TIL of Mary Babnik Brown, who donated her 34" untreated hair to the United States military during WWII after they determined that blonde hair that had never been treated or exposed to heat was the most resilient material to use as the crosshairs in bomb sights.