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TIL the iconic picture of Earth coined, 'The Blue Marble", was the first picture that viewed the entire planet as a whole and was only possible due to the sun being behind the Apollo 17 crew. Originally, the image was South up with Antarctica on top, but NASA flipped it to be more recognizable.

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QkaX TIL The Red Cross throws out blood if they deem it too risky, even if the donator is disease free.
19Md TIL in the UK the gov’t funds a service which you can notify about a person sleeping rough during winter, and they will find that person and arrange a bed for the night.
9Y7VB TIL despite having been discontinued in most of the world in the mid-1990s and having exited the video game console market, the 8-bit Sega Master System is still produced in Brazil, and its market share rivals more modern gaming systems there
wokEJ TIL about airship spy baskets. Used by Germans during WW1, an airship hidden above clouds would lower a basket with a lookout below the clouds to help navigate or find bombing targets.
lowBB TIL the Girl Scouts had a "Computing Fun" badge in the 1980s that featured the binary code 00111 10011 on its patch. This translated to 7 and 19, and when mapped onto the order of the alphabet stands for G S, the Girl Scouts.