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TIL of chorea gravidarum, a rare neurologic condition in which pregnant women develop involuntary writhing/jerking movements similar to those in Huntington's disease. It usually resolves completely after delivery.

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KOm96 TIL that Lambs Ear (the plant) can be used medicinally for insect stings, bug bites, hemorrhoids, scrapes, and burns. It can also be a substitute for bandages and can act as an antibacterial, antiseptic, and antifungal.
oBOYr TIL sound can be focused into a singular spot with an acoustic lens like light with an optical lens
Oo5AR TIL that olives are essentially inedible when picked. It takes an extensive curing process for them to become edible, with no history of how an inedible fruit became such a popular fruit.
m1JAx TIL the International Court of Justice could not conclusively decide whether a country may use nuclear weapons in self-defense if its survival is at stake.
9YvlQ TIL the oldest living human-planted tree in the world with a known planting date is the sacred fig tree "Jaya Sri Maha Bodhi", planted in 288 BC.