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TIL that Charles Darwin was one of the first people to come up with the idea of putting wheels on his office chair, so that he could work faster

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d8eyr TIL The Emperors of Eastern Rome's personal bodyguard was made up of Vikings (as well as other groups of Western European warriors), called the Varangian Guard
JYbem TIL that Martin Luther King Jr. won a Grammy at the 13th Grammy Awards in 1971. That is one more than Katy Perry, Snoop Dogg and Nicki Minaj.
ZQpD TIL that lightning can cause red, jellyfish-shaped flashes as big as 48 by 48 km to appear above thunderclouds. These are called sprites (air spirits), after their elusiveness, and are actually clusters of balls of plasma.
Wkpnd TIL that Texas still has a mutual combat law. This means that duelling is still legal according the Texas penal code. The law states that any two individuals who feel the need to fight can agree to mutual combat through a signed, verbal or implied communication and have at it (fists only, however).
1aGLr TIL that if you get a blood transfusion with the wrong blood type a strong sense of impending doom will likely occur.