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TIL that the first visit of a sitting US President to Mexico didn’t occur until 1909

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XE7Z6 TIL that there's a lab on the International Space Station dedicated to freezing atoms to nearly Absolute Zero in order to study Bose-Einstein condensates, a fifth form of matter
xLLo TIL In Nordic mythology, Ratatoskr was a squirrel whose sole job was to carry (usually insulting) messages between a great eagle and a dragon at opposite ends of Yggdrasil, the World Tree
4XgRX TIL when Amiens Cathedral was about to collapse (ca. 1500), a huge iron chain was installed inside the walls while still red hot. It pulled the stone arches back into shape as it contracted and cooled.
XEeJE TIL that if you planted the seeds of a Granny Smith apple, you wouldn’t get Granny Smith apple trees. Apples aren’t “true to seed”.
awZ4A TIL The prototype of the Rolls Royce Ghost was so quiet inside that it made test drivers sick. The engineers had to remove some of the noise isolating material, and create seats that vibrated at specific frequencies to introduce some noise into the interior.