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TIL There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon)

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78laX TIL the 2005 NASA Authorization Act established the ISS National Lab on the US segment of the International Space Station. This act opened up the station for academic, private and government access to many of the space stations research facilities.
QNxpX TIL: That L-8 also known as the "Ghost Blimp", was a United States Navy L-class airship whose two man crew disappeared over the Pacific Ocean on August 16, 1942 and then eventually landed on it's own near San Francisco.
GYbYJ TIL that Popeye the sailor man was based on a real guy from Illinois.
AD7Dl TIL from Paul Stamets “6 ways mushrooms can save the world” TED talk, that mushrooms and mycelium are powerful antibiotic agents with many potential untapped applications in pharmaceuticals, pesticides, terraforming other planets, ecological healing/the reestablishment of biospheres, and much more.
x6NBD TIL that some of James Cook's maps were still in use until the mid-20th century due to their remarkable accuracy and continued relevance after 200 years