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TIL a cat’s purr is typically between 25Hz and 140Hz. These levels have shown promise in healing bone and joint problems, so much so that the rate of healing for broken bones has shown to increase.

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wnoJ TIL that Japanese write husband as “lord-person” and wife as “house-inside”. Also, testicles are “golden-balls”.
6EXRw TIL during a press conference in June 1943 Congressman Andrew May noted that Japanese depth charges detonated too soon to be effective. The Japanese changed depth charge tactics after the press releases, killing 800 US submariners
pYNWN TIL that if you hear "Stars and Stripes Forever" at a circus, you better run toward the exits. Circuses use the song as an way to alert employees that there's a disaster afoot, and they won't play the song at any other times.
OGB9a TIL talcum powder is made from a material which is often mined from locations with deposits of asbestos
KRw4 TIL a US nuclear submarine that sank in deep water in 1968 is still resting at the bottom of the sea at a known location. Its nuclear reactor and nuclear weapons have never been recovered.