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TIL in 1929, German doctor Werner Forssmann performed the first human cardiac catheterisation on himself. After ignoring his boss and tricking a nurse into helping him, he inserted a catheter into his right arm before calmly walking to the x-ray department. He was later awarded with the Nobel Prize.

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BgX4x TIL The US military sprayed 73 million liters of Agent Orange on Vietnam and was originally called Operation Hades. US soldiers, unaware of the dangers, sometimes showered in the empty 55-gallon drums, used them to store food, and repurposed them as barbecue pits.
l79La TIL about America's first Olympics in 1904 where, during the marathon athletes drank poison, dodged traffic, stole peaches and hitchiked!
yQ7ow TIL Sihanoukville is Cambodia's sole deep water port. The French colonial administration preferred to use Saigon for international trade and the Mekong River for further distribution. Thus Cambodia's access to high sea's trade was via the Mekong which required passage through Vietnamese territory
e0raJ TIL blobfish don't normally look all blobby and only look like that when they're pulled from the deep ocean. Its due to the pressure difference
gBl4 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.