› added 1 day ago

Today I learned about secret ingredient in Leonardo da Vinci paintings. He may have used proteins, especially egg yolk in his oil paintings.

Read more cnn.com

via reddit.com

5VGak TIL the term 'air conditioning', coined in 1906 by Stuart W. Cramer, initially referred to an air humidifying system developed for textile plants. Willis Carrier later adopted the term to apply to his air cooling systems.
VMWVQ TIL around 15% of active Twitter accounts are social bots. This means there are nearly 48 million accounts that are not controlled by humans.
QJklp TIL in Jewish mythology, everyone has an angel teaches them all the wisdom in the world in utero. The angel lightly taps an infant's upper lip before birth, to silence the infant from spilling the secrets. Some say that's how we have the philtrum (the indent between the nose and mouth).
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LQlvP TIL of Amelio Robles Ávila, a colonel who fought in the Mexican Revolution. Assigned female at birth (in 1889), he adopted a male identity from the age of 24 and lived openly as a man until his death at age 95.