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TIL in 2012, Canada had a $100 bill featuring an Asian-looking woman using a microscope, but after focus group complaints, changed her ethnicity to Caucasian.

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Xyv6 TIL that the term “Gaslighting” comes from a 1938 stage play called Gas Light in which a husband tries to make his wife think she’s going insane through mental manipulation
W7eXY TIL male dolphins will kill baby dolphins of another father so that the female will be available to mate with them.
W5A4 TIL during the Manhattan Project, a production race was held between two calutrons, one run by “hillbilly” girls and the other run by Ph.Ds. The girls won the contest because “the scientists could not refrain from time-consuming investigation of the cause of even minor fluctuations of the dials”
gr6d7 TIL When the 48th Imam of the Nizari Ismaili, Aga Khan III, died in 1957 his will declared his grandson his successor. This was the first time succession had not passed from father to son in the sect's 1300 year history. Aga Khan III felt that the rapidly changing world needed a young leader.
W7GZ9 TIL The popsicle was invented by an 11 year-old boy when he accidentally left a cup of powdered soda mix with a stirring stick outside on a freezing night