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TIL about Leo, an early socio-interactive robot built in 2002. Leo was programmed with psychological theory and spatial scaffolding. It is able to communicate by perceiving expression, gesture, speech, and thus responds appropriately with equal expression, gesture and speech.

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via reddit.com

4B1J TIL each year the most powerful men in the world meet at Bohemian Grove in California to put on a play, practice nudism, drink, and have super secret talks. In 1942, the planning for the Manhattan Project took place at the grove, leading to the creation of the atom bomb.
dD0K9 TIL Glass frogs have translucent skin, allowing you to see their organs, bones, and even their beating heart. Found in Central and South America, they use this feature as camouflage to blend in with their surroundings. They have adapted to life in the rainforest and are surprisingly resilient.
6EppW TIL: Dogs have anal sacs that secrete liquid scent when defecating and this is why they smell butts
b9R0p TIL - Anni-Frid Lyngstad of ABBA was one of the backing vocalists singing the words "Moviestar, oh Moviestar, oh-oh-oh" on Harpo's hitsingle Moviestar from 1975
J1km TIL Albert Einstein and his first wife had a daughter, but no one seems to know what happened to her after she was a year old.