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TIL the organization of the periodic table of elements was created by Russian chemist Dmitri Mendeleev after having a dream where, in his dream, the elements arranged themselves by their atomic weights and electron properties.

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via reddit.com

WkXEd TIL of the Basus war, a 40 year conflict between two cousin tribes during late antiquity in Arabia over the killing of a camel.
x0Pw TIL the founder of the Samaritans (the suicide hotline) was Chad Varah, an Anglican priest whose first service was a funeral for a fourteen-year-old girl who died by suicide because she had begun to menstruate and feared that she had a sexually transmitted disease.
GYBkQ TIL about The Devil's Bible - It is the largest illuminated bible still existing in the world and in fact the largest known medievil manuscript. It has a curious full-page image of the devil himself.
awYoM TIL that birds’ knees don’t bend backwards—we’re just looking at their ankles!
v1Zbj TIL: The first combat submarine to sink a warship also simultaneously sank itself.