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TIL of the Sator Square, a palindrome word square found in the ruins of Pompeii. The five words carved into it, "SATOR AREPO TENET OPERA ROTAS" can be read top-to-bottom, bottom-to-top, left-to-right, or right-to-left.

eVeg TIL a 1m hammock made from a single-atom thick sheet of graphene could support a 4kg cat, whilst being invisible to the human eye
nkJo TIL that for decades, the German Army issued a handheld single shot disposable flamethrower. The 16 inch long “Handflammpatrone” weighs only 1.4lbs(620g), yet it has a range of 90 meters…and can burn a surprisingly large area.
Bg46x TIL that the Nation of Islam, the Muslim sect that Muhammad Ali and Malcolm X followed, teaches that the original humans were Black and spoke Arabic, white people were created by an evil scientist named Yakub, and the founder W. Fard Muhammad will return in a mothership to commit a racial cleansing.
e0o0D TIL in 2018, a firefighter in Massachusetts was reprimanded when he received a call from a concerned cat owner about their pet being stuck in a tree and he responded with, “I’m sure they’ll make their way down eventually. I’ve never seen a cat skeleton in a tree before.”
YpZPd TIL that in the Garfield comic strip, Jon originally had a roommate named Lyman, who was also Odie's owner. He stopped appearing after a few years. Cartoonist Jim Davis has never confirmed what happened to him--all he's said on the subject is "Don't look in Jon's basement!"