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TIL American eugenicists used state fairs to host Fitter Families Contests which judged "human stock" to select the most eugenically fit family.

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JK5v TIL We Used To Sleep In Two Segments Every Night Until Electricity Was Invented
OoNee TIL Jeff Bezos sends '?' emails to his employees to "keep them on their toes."
vV6R TIL that hyenas give birth through their clitoris.
M7mab TIL Plato once offered a literal definition of humanity: he called a human “a featherless biped”. Cynic philosopher Diogenes took it literally – he plucked a chicken, strode into Plato’s lecture hall & announced, “Here is Plato’s man.” Plato had to add “with broad, flat nails” to save face.
771P Til the Namib Desert Beetle drinks water from the fog, as it moves across the desert. The droplets collect on the beetle’s shell & trickle down to its mouth. The shells architecture is being studied for water harvestation.