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TIL Theodore Roosevelt kept a White House pet hyena named “Bill.”

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via reddit.com

X0owj TIL in 1971 a Time Dilation experiment had 2 flights w/atomic clocks go around the world to prove Einstein's theories of relativity (time moves slower as you approach the speed of light, and/or when exposed to less gravity). The clocks gained 0.15 microseconds compared to the ground based clock.
ZpvyD TIL about a quarter of the registered hosts on Airbnb own nearly two thirds of the listings. Wealthy users buying multiple houses to rent out is a significant contributor to the current housing crisis.
4Xmda TIL kraftwerk have a phone that doesnt ring that they answer at a specific time
yQJDp TIL Princess Elisabeth of Hesse was royal in England, Russia and Germany. She and her husband were murdered by Russian Revolutionaries. Her body was buried in Russia, then moved to Beijing, China and is now buried in a Russian Orthodox Church in Jerusalem.
lopY1 TIL of Project Valkyrie: a theorized lightweight interstellar spacecraft that could attain 92% lightspeed. Components are tethered, with the crew 10 km away from the antimatter engine. A system would spray liquid droplets in front of the craft to shield against interstellar dust particles.