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TIL that during the 1918 flu pandemic, 62 Boston prisoners volunteered to be injected with infected tissue and sprayed with infectious aerosols with a promise of release if they survived. All of the prisoners lived, but the ward doctor died soon after.

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77QX TIL Sgt. Joseph R. Beyrle was captured during the D-Day airborne invasion but later escaped into Soviet lines. He fought with the Soviets and was eventually sent back to the U.S. He was awarded U.S. and Soviet medals.
R5Lr9 TIL a Japanese man Yasuo Takamatsu lost his wife in the 2011 earthquake and has not stopped looking for her body for more than 10 years and has dived more than 800 times in the ocean to retrieve her.
VMO10 TIL that the National Orchestra of Wales used a "sound box" so deaf people can experience a concert. Through vibrations, it transmits music to people with their hands on it or even lying on top of it. One participant called it "something none of us would ever have thought that we would experience."
wL5JP TIL That if you make a hologram of a magnifying glass, the holographic version will magnify the other objects in the hologram, just like a real one.
5VmB8 TIL that the stationary lifestyle of barnacles makes sexual reproduction difficult, as they cannot leave their shells to mate. To compensate, they evolved to have the largest penis to body size ratio of the animal kingdom: up to eight times their body length.