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TIL that no one could describe the color 'blue' until modern times

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via reddit.com

OG8JL TIL the Appalachian Mountains are amongst the oldest mountains on Earth. So old, in fact, that they predate life and so they have no fossils.
BrZLy TIL Color Blind people can see the differences in texture and brightness more intensely than normal people and were even used in WWII to spot camouflage.
R7wP7 TIL to increase circulation of dollar coins, in 2008 the US Mint allowed individuals to purchase in bulk with free shipping. It was quickly exploited as a way to gain frequent flyer miles. People purchased coins with a credit card, then deposited them at their bank to pay the bill, cost free.
neNKb TIL it's only called an acronym when you pronounce the abbreviation as a real word (ex. NASA). Otherwise it is known as an initialism (ex. FBI).
MWyB TIL Michael Jackson was a big fan of Weird Al, but requested that he not record a parody of ‘Black or White’ because the message was too important.