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TIL Facebook is blue because Mark Zuckerberg is colorblind and sees blue best.

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via reddit.com

J1JV1 TIL this date in 1857, my Great Uncle, a Mormon leader, began distributing children under the age of 8 to families in central Utah to adopt. He and his other Mormon friends had slit the throats of all the other children and adults.
0dWNL TIL that lead shielding during an X-ray not only isn’t necessary but may expose you to even more radiation
KOoZE TIL of John Woods, an Army private who lied his way into becoming the Army's hangman and an officer. He carried out 60-70 executions in two years, several of which he bungled by building the gallows too short, including all ten of the Nuremberg Executions of the Nazi high command.
xXBB TIL the skin of a honey badger is so thick that it can withstand multiple machete blows, arrows, and spears. The only sure way to kill one is via a club to the skull or gunshot.
5YMVQ TIL the first female American astronaut Sally Ride was a respected astrophysicist and a top athlete. However, before her flight, she fielded questions such as "Will the flight affect your reproductive organs?", "Do you weep when things go wrong?" and "Will you become a mother?" from the US media.