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TIL John Young is the only astronaut to walk on the Moon and fly the Space Shuttle. He also flew in the Gemini and Apollo programs, commanded the first Space Shuttle flight, and participated in the Spacelab program. He left NASA after criticizing its safety following the Challenger disaster.

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4XMe6 TIL 'Pakistan' is both a Persian and an Urdu word. It is composed of letters taken from the names of homelands, and means the land of the Paks - the spiritually pure and clean
N7L5J TIL the six-cylinder Holden Torana was made just because Holden, GM's Australian arm, did not have a four-cylinder engine, which was considered more suitable for a car of that size. The unusual move turned out successful and launched a group of imitations from other brands.
yVBmp TIL about aaa, a constellation of urological problems described on multiple ancient Egyptian medical papyri. Many archaeologists believe aaa was what is now known as urinary schistosomiasis, a parasitic infection.
kr0e TIL There is a pistol that fires the same round used in the Barrett .50Cal BMG Sniper Rifle used by special forces snipers, and it looks like something from Star Wars! (video in comments)
JYykB TIL the U.S. Constitution forbids members of Congress from holding ‘any office under the United States’ concurrent with their congressional service. Legal scholars have concluded that individuals holding military commissions should be barred from serving in Congress.