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TIL that a species of self-cloning crayfish was discovered in the German pet trade in the 1990’s. Every individual is female and genetically identical. There are no known natural populations.

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Wdpd TIL 1986, a world-class runner dropped out of the middle of a 10,000 meter race and jumped off a bridge. She did not die, but she became quadriplegic. “All of a sudden, I just felt like something snapped inside of me”
KOV7G TIL about ATLAS-I, aka Trestle, the world's largest structure made entirely of wood, glue laminate, wooden bolts/nuts and sufficient to support a fully loaded B-52 bomber (for elevated EMP testing) 1,000 ft long, 125 ft (about 12 stories) tall, and constructed of 6.5 million board-feet of lumber.
Lk9Ep TIL that George Gershwin was in psychoanalytic therapy for several years for “aberrant” behavior, olfactory hallucinations, loss of coordination while eating, and severe headaches, and it wasn’t until he died that they figured out he had a brain tumor.
dnj TIL that a Roman merchant who sold fake jewels was sentenced to face a lion in the arena. When the gate finally opened, a chicken walked out. Emperor Gallienus proclaimed “He practiced deceit and then had it practiced on him.”
Xnx6 TIL that on average 12 high school and college football players die each year during practices and games.