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TIL Arborglyph is the carving of shapes and symbols into the bark of living trees. Derived from arbor ‘tree’; glyphein ‘to carve’. It was also mentioned in Shakespeare’s ‘As You Like It’; the love-frenzied Orlando declares he will carve every tree in the Forest of Arden.

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4X7L5 TIL The Horror film "Unfriended", on the theme of cyberbullying is told almost entirely through a screencast of a MacBook. Production was 16 days total and at least one full, 80-minute-long take was filmed, with each actor in separate rooms with separate computers
Lkn89 TIL that a herd of wandering wild elephants have become celebrities in China as they make a 15 month, 500 km odyssey from their forest reserve. Rather than capture them, the Chinese support their migration via drone monitoring and corn and pineapple food deliveries
X0GZE TIL about Mare Moscovrae, a lunar mare meaning "Sea of Moscow". Such maria were named after mental states or words for water in that era, but despite this tradition, the IAU accepted the name. At the meeting, French astronomer Audouin Dollfus said "Moscow is, in fact, a state of mind".
BobL TIL Romans used urine as mouthwash, they even paid high dollar to have large quantities shipped in from Portugal because they didn’t think their own pee was exotic enough.
wd47 TIL: Women who perform oral sex on their husbands decrease the chances of some complications during pregnancy. The incidence of such complications decreases further if she swallows.