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TIL Manhattan is encircled by an 18-mile-long fishing line called an eruv, which symbolically extends the private domicile to the area it encloses, allowing observant Jews to carry items (such as keys or a baby stroller) out of their homes on the Sabbath.

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nWamd TIL about Heraclitus, a pre-Socratic Greek philosopher, who introduced the concept of 'Panta Rhei' (everything flows) and famously stated 'One cannot step twice in the same river.' His philosophical stance emphasized the constant flux and transformation in the universe.
VOMZ TIL Queen Elizabeth ordered an archbishop to take out a tooth of his own not once but TWICE just to prove the procedure of extracting a tooth was safe and bearable.
6jXY TIL that Bottlenose dolphins like to do drugs by finding pufferfish, (which produce a powerful neurotoxin and are deadly to eat) and gently chew on them to “get high” on a small amount of the toxin, and will even pass a pufferfish around to other dolphins to share the “drugs.” Puff puff pass!
jeJp TIL the term ‘geek’ originally refered to circus performers who bit off the heads of live chickens.
ANJBa TIL the "taste bud mapping" we learned in school has been discredited for years and is still a mystery.