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TIL about Belphegors Prime number, 1000000000000066600000000000001. One, followed by 13 zeroes, 666, another 13 zeroes, and one again. It’s 31 digits long and is also a palindromic prime number. Discovered by mathematician Harvey Dubner, Belphegors prime is named after the demon of inventiveness.

Me1pb TIL Tesseract is the name of a real geometrical concept - it is a cube in 4-dimensional space. It is a 4D shape whose every face is a cube. Just like a cube can be unfolded into 6 squares in 2D space, a tesseract can be unfolded into 8 cubes in 3D space.
x6101 TIL Between 43 and 42 BC, a commemorative coin was produced to celebrate the assassination of Julius Caesar on March 15th, 44 BC. Marcus Brutus is minted on the heads side, while the tails side has a pileus cap between two daggers.
pMnA TIL Joe Pyne once started his interview with Frank Zappa by saying “So I guess your long hair makes you a woman.” to which Zappa responded “So I guess your wooden leg makes you a table!”
9Y4wG TIL of the thousand day ordeal of the Marathon Monks of Japan. They run daily marathons for hundreds of days, endure 7.5 days with no food, water, or sleep, and chant 100,000 mantras in front of a scorching fire. They carry a rope and a dagger with which to commit suicide if they fail.
e0Dp5 TIL That Presidential candidate Andrew Jackson was the first Democrat ever to be associated with the donkey symbol. His opponents during the election of 1828 tried to label him a "jackass" for his populist beliefs. Jackson was entertained by the notion and ended up using it on his campaign posters.