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TIL an authentic smile is called a "Duchenne Smile". It happens when the zygomaticus major muscle lifts the corners of your mouth at the same time the orbicularis oculi muscles lift your cheeks and crinkle your eyes at the corners.

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BOZW TIL on British coins, the direction in which the monarch’s head faces alternates with each successive monarch.
8KrV TIL that in Finland, nine out of ten plastic soft drink bottles are returned for re-use. Almost one hundred percent of all glass bottles are recycled – more than anywhere else in the world.
M4PW TIL the Miss Navajo Nation pageant requires contestants to butcher a sheep
rRYkM TIL for the first 40 million years that woody trees were around, wood was not biodegradable...until a fungus figured out how to rot it
mxbDp TIL when Fatima Othman, a disabled street beggar, died in an abandoned car in Beirut, she was found to be carrying 5 million Lebanese ounds in cash and a deposit book showing more than $1 million in savings.