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TIL obsidian is one of the earliest materials used for knife blades. 2.6 million years latter surgeons still use obsidian for scalpels as it is sharper than any other material in use and is noted to cut more cleanly so as to not leave a scar.

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EgDgP TIL, Rolls Royce has an stained glass window commemorating the pilots of the RAF (Royal Air Force) who fought at the battle of Britain during WW2 in a factory in Osmaton, Derby (UK).
8aO6a TIL the longest named muscle is the 'levator labii superioris alaeque nasi'. It's the muscle that is used when sneering.
p8YaQ TIL that after the Library of Congress was burned by the British in 1814, Thomas Jefferson offered his entire personal library as a replacement—more than doubling the previous size of the library to 6,487 volumes
aXvo TIL that Many Koreans believe that if you leave a fan on over night you will die. Fans are sold with timers so you don’t accidentally die.
wgW TIL there is a section running across the entire southeast US where blacks outnumber the whites called the “Black Belt”