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TIL about Toivi Blatt and the 1943 Jewish uprising at the Sobibor death camp in Poland, one of three camps built for Operation Reinhardt. During the armed revolt by the Jewish prisoners, the Nazis were overpowered allowing several hundred to escape to freedom. The camp was never opened again.

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eplvE TIL in the Red Sea, giant moray eels have been observed hunting cooperatively with coral groupers. The grouper approaches an eel's hiding place and shakes its head rapidly to indicate that it wants to hunt. The eel recognizes the signal and accompanies it on the hunt where they work in tandem.
dDKDQ TIL, On saturn, it literally rains diamonds | BBC Earth
Q6AL TIL that, unlike most bronze sculptures of Roman emperors, the equestrian statue of Marcus Aurelius was not melted down during the Middle Ages because Europeans of that time thought it was a statue of Constantine, the first Christian emperor of Rome.
OGxrL TIL about the tiny hairs on Zucchini plant called "trichomes," tiny little bristles that can hurt the hands if not washed away properly.
Vb90 TIL that trees actually sleep at night, relaxing their branches after dawn and perking them up before sunrise.