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TIL that the Battle of the Bulge marked the first time the U.S. Army desegregated troops during WWII.

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0dEX5 TIL that at room temperature, air molecules vibrate at roughly 1,100 mph (~500m/s) — about 50% faster than the speed of sound.
MrPb TIL the movie E.T. was criticized for having a complete absence of non-white characters.
J1mOm TIL there are 5 dwarf planets in our solar system, the criteria for which is they must orbit a star, be round, and clear similar-sized neighbors. Pluto is currently one of those 5, demoted on August 24, 2006.
v19Xx TIL sperm whales click loud enough to hear each other from thousands of miles away. Some researchers believe this is how they can communicate with each other from opposite sides of the planet. And if you’re close enough, the vibrations can paralyze or even vibrate you to death.
4XZO5 TIL that the UK invaded Iceland on May 10, 1940, fearing that the Germans would invade it first. Despite a shortage of weapons, an only partially trained force of 746 newly activated Marines, and a lack of surprise, the British were victorious. No one was injured, except for one UK suicide.