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TIL the fact that there are seven days to the week, internationally, and that the Sun day is followed by the Moon day, happened thanks to ancient Mesopotamia or Egypt passing it on to Greece, Rome, India, Japan...

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X0Xdr TIL that Arthur Hill Hassall (1817– 1894) was a British physician, and a pioneer in the use of the microscope as a tool in medicine and public health. In 1846 he published a two-volume study, ‘The Microscopic Anatomy of the Human Body in Health and Disease’, the first English textbook on the subject
v1bRR TIL that during the raid to kill Bin Laden nobody brought a tape measure and a 6 foot Seal was used as a human tape measure to verify Osama Bin Laden's height.
oRyGr TIL that in the original United States Articles of Confederation, "Canada" (Quebec) had an open invitation to join the United States at their own choosing. Other colonies could only be admitted by a vote of existing states.
b9eyp TIL the bell on early cash registers (circa 1884), not marketing, is why prices like $1.99 rather than $2.00 exist. The 1¢ change back to the customer forced the cashier to open the till, ringing the bell, and make change. Otherwise the sale could more easily be pocketed by the clerk.
OGyna TIL that in 1991, singer Reba McEntire's band left San Diego in two private planes, with McEntire, her husband and her stylist intending to follow in a separate aircraft the next day. One of the planes crashed, killing 8 members of McEntire's band.