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TIL windsocks (like those used at airports and heliports) are often used at industrial buildings that use ammonia as a refrigerant so emergency responders know which areas are downwind if there’s a leak

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via reddit.com

e0mAb TIL that the concept of a soulmate was originally put forth by Plato. According to his story humans originally had 4 arms, 4 legs and 2 faces. The gods feared humans were too powerful and so Zeus split them in two, condemning them to spend their lives searching for the other half of their soul.
log1r TIL Dick Van Dyke got his first TV job as a game show host for the original The Price Is Right in 1956
Aved TIL more countries start with ’S’ than any other, but ‘A’ covers the most area, and 'I’ the greatest population
jNWYR TIL that a mirror is used to treat phantom-limb pain (Pain in a limb that was amputated but the brain still thinks is attached)
a8njN TIL the series "Schoolhouse Rock!" was the idea of an ad executive who noticed his young son was struggling with learning multiplication tables, yet had no problem memorizing lyrics. He asked Bob Dourough to set them to music. This ended up becoming the song "Three is a magic number".