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TIL CAT, the heavy equipment manufacturer, is short for Caterpillar.

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dDWLB TIL that a Blink Comparator is a mechanical device for visually comparing two similar images. In 1930, it was instrumental in the discovery of Pluto.
JYjvQ TIL Alabama did not repeal its ban on interracial marriage until 2000. 40% of people voted against the repeal.
LQrv0 TIL That upon her marriage, Olivia Wilde became a princess of the Papal nobility.
eprRb TIL that Alberta King, Martin Luther King Jr's mother was shot and killed while playing the organ at a church service. Her killer was sentenced to death, however, the King family—consistent in their commitment to nonviolence—successfully campaigned to have his sentence commuted to life in prison.
XalP TIL of Jack Ketch, an English executioner in the 1600s whose name became synomoymous with Satan, death and excecutioner because of the brutal inefficiency of his excecutions