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TIL when John Connally died in 1993, there was a petition to recover the fragments of the bullet that hit him in Kennedy's assassination, hoping to disprove the single bullet theory. Department of justice replied that it would approve if Connally's family gave permission, which they refused to give.

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wL7wW TIL of Farley Files, created by Roosevelt's Campaign Manager, James Farley. They were notes about everyone FDR ever met (e.g. spouse's name, hobbies, prior meeting notes). Farley & FDR would review the files prior to any meeting and the effect was powerful and intimate for visitors.
dJ17 TIL the Post Office Tower, then the tallest building in London, despite being open to the public and having a restaurant at the top of it, was an “Official Secret” and consequently not marked on any maps.
PYE5e TIL Airlines all over the world are flying 10% slower than they did in 1960 to save on fuel costs
OGaoa TIL that as far back as 400 BCE, the Chinese used rapid fire Crossbows that could shoot 7–10 bolts in 15–20 seconds, with an effective range of 70 meters and a maximum range of 180 meters. They were primarily used for defense of gates and doorways.
v1e0j TIL of the Eidophone, an instrument which created images from the interaction of voice and materials. Inventor Margaret Watts-Hughes, a Welsh singer, was working with a device similar to Bell's Photophone when she noticed perfect geometrical patterns formed according to clarity and calibre of voice.