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TIL: 1000000000000066600000000000001 is known as Belphegor's prime; a palindromic prime number (a number which reads the same both backwards and forwards and is only divisible by itself and one). The name refers to one of the Seven Princes of Hell.

grVrb TIL that barrels placed on roof tops, as seen in old West photos, serve as a fire suppression.
loBpK TIL that there is a German word, verschlimmbessern, to define the act of making something worse in a failed attempt to improve a situation, e.g. trying to dislodge a ball stuck in a tree by throwing another ball at it - which subsequently also gets stuck.
rR0dy TIL about William Breckinridge, a captain of the Confederacy who later renounced the views that led him to fight for them and became a racial equality advocate. He also represented blacks in court as a lawyer and was even noted by a black lawyer that he had helped many blacks in their law careers.
PYRKO TIL Kanō Jigorō, creator of judo, also served as the Japanese representative to many Olympics and had a pivotal role in securing Japan's bid for the 1940 Olympics. He was indifferent towards the inclusion of judo, however, as it was not "mere sport" but rather "a principle of life, art and science."
wo0OJ TIL of an experiment, in which white test subjects participated in the psychological ‘rubber hand illusion’ experiment but were given black arms instead of white ones. Doing this measurably reduced their implicit racial bias.