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TIL that the Vehicle Assembly Building at NASA's Kennedy Space Centre is home to the four largest doors (each bay door is 139 metres high) and largest American flag (63.7 metres by 33.5 metres) in the world; the doors take 45 minutes to open.

Read more nasa.gov

via reddit.com

N7WdJ TIL of Rosalind Franklin, a X-ray crystallographer whose discovery of the double-helix structure of DNA went uncredited for years is now beginning to finally get her due credit.
D1ovV TIL of "Hammer" Simwinga, a Zambian man who has helped stop poaching in North Luangwa Nat'l Park. Most villages near the park relied on poaching for income. Simwinga eliminated the need for poaching for 35K+ people in 60 villages by teaching sunflower planting, beekeeping, & sustainable farming.
QJGKL TIL That in 1933, Adolf Hitler made friends with a young Jewish girl, Rosa Nienau, whilst he was staying at his mountain retreat. After the meeting they became penpals and the correspondence carried on right until 1938 when Hitlers secretary told her to cease contact.
vPNgx TIL that because of its strategic importance and impregnable position during the Napoleonic Wars, the Diamond Rock, off the coast of Martinique, was considered a warship by the British Admiralty, which conferred on it the title of HMS Diamond Rock, turning the rock into a stone frigate.
p8ALO TIL: The International Space Station orbits about 220 miles above Earth. To put that in perspective, if Earth were the size of a basketball, the space station would be about 1/4 of an inch (<7mm) off the surface.