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TIL that the vertical line in the Peace Sign represents the flag semaphore signal for the letter D, and the downward lines on either side represent the semaphore signal for the letter N. “N” and “D”, for nuclear disarmament, enclosed in a circle.

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R5dE7 TIL that Kit Kat bars are made up of imperfect rejected Kit Kats bars that are mashed up into a paste that's used to fill the wafers.
Nmw6 TIL New College (f 1379) has a hall made with oak beams. A century ago it was found the beams were infested w/ beetles; Finding replacements would be difficult, however, in the 1300s New College had planted groves of oak trees w/ the sole purpose to replace the beams when they became full of beetles
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.
vgyL TIL American pediatrician Saul Krugman deliberately infected thousands of mentally disabled children with Hepatitis B between 1950-1972 to further his research in vaccinology. He was made president of the American Pediatric Society in 1972.
PY5XO TIL about the 1997 Jarell tornado, which is considered the most destructive tornado in recorded history. By the time rescuers arrived at the Double Creek subdivision where 27 people had died, there was nothing in sight except bare slabs of foundation and ripped up dirt.