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TIL 17-year-old Harvard student, Ted Kaczynski, was one of 22 subjects in the CIA-sponsored Project MKUltra. It focused on measuring people’s reactions under extreme stress. Assaults to their egos, cherished ideas and beliefs were the vehicle used to cause high levels of stress and distress.

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loVjK TIL: A group of caves in Spain called Cuevas de la Araña contain multiple ancient cave paintings. One such painting is called the "Man of Bicorp" depicting a caveman holding onto vines to gather honey from a beehive, estimated to be around 8000 years old.
NXYLP TIL that mature oak trees can reach heights of around 148 feet and can live up to 1,000 years. Oak trees have existed for 65 million years, and a single oak tree can produce around 10 million acorns during its lifespan. Out of these acorns, only 1 in 10,000 grow into an oak tree.
a86rA TIL a tool bag weighing 30 lbs and worth $100,000 was accidentally dropped by astronaut Heidemarie Stefanyshyn-Piper during a spacewalk in 2008. The bag subsequently re-entered the Earth's atmosphere and burned up in 2009.
wodeJ TIL "Rudolph the Red-Nosed Reindeer" is the longest continuously running Christmas TV special in the United States, having aired yearly since 1964.
0dmL5 TIL That there was mysterious stone found buried in the ground in New Hampshire in 1872 that has no known age, purpose or origin.