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TIL When colored vinyl 45's were introduced in 1949, the colors indicated what type of music was on the 45.

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oe5r TIL 10 Downing Street, the residence of the Prime minister of the UK, has a cat with a government title of Chief Mouser to the Cabinet Office. His day-to-day responsibilities include contemplating a solution to the mouse occupancy of the house.
vP49D TIL that as early as 1802, Thomas Jefferson designed a cypher wheel to encrypt messages. It's unknown if he ever actually built or used one, but a similar tool was invented for the U.S. Army to use from 1920 until the start of WWII. Jefferson's designs were discovered shortly after.
141r TIL a noblewoman (a widow of a samurai lord & descendent of a long line of ninjas) recruited, trained, & led an all-female group of 200-300 ninja agents—consisting of ex-prostitutes, orphans, & civil-war victims—who were successfully deployed for the Takeda clan against rival warlords in 1500s Japan
nxbr TIL only about %4 of the money raised by the National Breast Cancer Research Center goes to research.
LkERQ TIL that a 19 year old girl called police to report an ex-boyfriend was stalking her. They fined her for wasting their time. Six months later she was murdered.