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TIL that there is a 150-year-old mosque in Iran that, when viewed from the interior at certain hours of the day, produces an intense kaleidoscopic effect due to its unique pattern of tiling and colored glass

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RLb1 TIL during Winter War, Finnish fighters propped up frozen Soviet soldiers to intimidate Soviet troops
GYOXQ TIL The Toba catastrophe theory that states human population was bottle-necked about 70K years ago due to a super massive volcanic eruption. Humanity may have dwindled to less than 10K individuals and many other animal species were similarly affected.
X4R6 TIL Rachmaninoff had hands so large that he could play C Eb G C G (An entire octave and a half!)
Rk6l TIL adult cats do not produce lactase, the enzyme needed to digest lactose, so you should NOT feed an adult cat a saucer of milk.
OoJM4 TIL about gleaning, collecting leftover crops from farmers fields after they have been commercially harvested or not profitable to harvest. It is described in the Hebrew Bible that became a legally enforced entitlement of the poor in a number of Christian kingdoms