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TIL that the ceremonial handguns carried by Sentinel NCOs at the Tomb of the Unknown Soldier are highly unique and customized SIG SAUER M17s of which 4 exist. Made with nods to history such as grips made from wood off the USS Olympia, the ship that transported the original Unknown back in 1921.

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via reddit.com

BrkGk TIL that in 1997, Julie Rea Harper scuffled with a man in her home who had broken in and killed her son. She was initially tried and convicted of the murder, but after a later apprehension, serial killer Tommy Lynn Sells admitted to Harper's account and his guilt, resulting in Harper's exoneration.
6EbXw TIL about a unique example of unconscious bias during a workplace information session. When the iOS YouTube app gained the functionality to upload videos, 5-10% appeared upside down as they were filmed by left-handed people. The entire team was right handed and had not encountered the issue.
PY4RJ TIL that Shaq joined the Freemasons in 2011
0dEp1 TIL about the Central Park Squirrel Census, a project where hundreds of volunteers, known as "squirrel sighters," counted squirrels in Central Park. The census estimates there are around 2,373 squirrels living in the park.
kEPE TIL a computer tech forgot to install some new code in a server. This resulted in a high speed stock trading company that did $21 billion in daily trades to go bankrupt in 45 minutes