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TIL That in masonry, a "cornerstone" is the very first stone set as a reference point for all other stones, while a "keystone" in an arch is the very last stone put in place at the top to support the weight of every other stone.

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ADgXn TIL the first area-accurate world map was created in 1999 when Japanese architect Hajime Narukawa invented the Authagraph Projection, which divides a spherical surface into 96 triangles, transfers them to a tetrahedron while maintaining area proportions, and unfolds into a rectangle.
9Qv7 TIL that musician Beck’s last album was released only in sheet music form, for others to interpret. No cd’s, no digital download, just sheet music.
QNaJX TIL English synth-pop duo Pet Shop Boys named their first album Please so people could go into record shops and say "Can I have the Pet Shop Boys album, please?"
9KPD Today I Learned In 2000, a fight broke out while Zevon was performing “Werewolves of London” at the Bowery Ballroom in New York. Zevon stopped, waited for the fight to end, said “I bet this never happens at Sting concerts,” and continued the song.
ob6E TIL in August 1981, 11,000 out of the nation’s 16,000 air traffic controllers were fired by President Reagan after going on strike. Their union, PATCO, was dissolved and three of its leaders were sent to prison.