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TIL in anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine. It is named for the Atlas of Greek mythology, because it supports the globe of the head which is the skull. The atlas is the topmost vertebra and with the axis forms the joint connecting the skull and spine.

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V4LB TIL that the widely distributed Sears Roebuck catalog was also used as a popular substitute for toilet paper until it began to be printed on glossy paper (at which point some people wrote to the company to complain).
Mw0m TIL That Leonardo da Vinci claimed to have dissected more than 30 people in his pursuit to further understand human anatomy, and his more than 240 detailed drawings and over 13,000 words of observations revealed many then unknown characteristics of our bodies. However, all this remain unpublished.
BrZBd TIL of a serious plan to disassemble the Giza pyramids to use it as pre-cut building material in 1830s, proposed by ruler Muhammad Ali Pasha, but cleverly the plan was canceled due to false cost reports presented by his French chief engineer, who thought it would be the only way to save the pyramids
d8re7 TIL the Eternity puzzle launched in June 1999. Consisting of 209 pieces, it was marketed as being practically unsolvable, with a £1 million prize on offer for whoever could solve it within 4 years. The prize was paid out in October 2000.
V0 TIL Dr. Seuss cheated on his wife while she was sick with cancer for 13 years. She committed suicide because of his infidelity, and he later married his mistress.