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TIL LAX has an X at the end because before the 1930s airports had two letter identifiers. When identifiers were switched to three letters, many just added an X at the end.

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W7kB TIL Carl Sagan recorded a message for those who would make it to Mars. “Whatever the reason you’re on Mars is, I’m glad you’re there. And I wish I was with you.”
N7Xe8 TIL that the US Navy traditionally named ammunition ships after volcanoes or words relating to fire and explosions
rRrnW TIL the Ice cream truck jingle has a name: The Turkey and the Straw
5A09 TIL a US PAN satellite was launched in September 2009 and is so top-secret that no military or governmental organization claimed to have built it.
YMGB TIL in Korea, live baby octopus is served still wriggling on your plate - it is recommended that you chew it thoroughly before swallowing so that the tentacles don’t latch onto your throat while it goes down