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TIL Historians hoped to create a permanent indoor exhibit at Dallas Love Field to commemorate Johnson being sworn in as President there after JFK assassination. Plans came to a mysterious halt before the 50th anniversary in 2013. It is not fully understood why, the director refuses to discuss it

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RyEj TIL Purple is not considered a color in the visible spectrum, due to it not being a single wavelength color, much like white
kOlr4 TIL that the form of Chicken McNuggets are not random but are intentionally shaped the way they are
QJNOe TIL telling ghost stories was a Victorian Christmas tradition that has largely disappeared but survives in "It's the Most Wonderful Time of the Year" and "A Christmas Carol"
1aad4 TIL the first US naval ship to have electric lighting was the USS Trenton (commissioned, 1877). The lights were installed in 1883
d8GMj TIL the Hubble Ultra-Deep Field image was made from a total exposure time of just under 1 million seconds and in order to observe the entire sky to the same sensitivity the telescope would need to observe continuously for a million years