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TIL a physician successfully avoided incriminating DNA evidence being gathered from him for 5 years by implanting a tube of foreign blood and anticoagulants in his arm, from which he made sure all samples would be drawn.

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9wWOr TIL that Pilot FriXion ink is thermo-sensitive, and leave a notebook or homework near heaters or in a car on a hot day can make the ink invisible. To make the text reappear, you can simply put it in a freezer for a short period of time, the ink should reappear at around -10C/14F
6EBWw TIL Hershey's once developed a chocolate bar for the US Army that would remain solid up to 49C (120F) and was poison gas proof but was also very bitter to prevent soldiers from eating it unless in an emergency. Troops called it "Hitler's Secret Weapon" because of what it would do to their bowels.
EgQD7 TIL Mehmet Ali Ağca was an escaped murderer who fired four bullets at Pope John II in 1981. Two of the shots entered the Pope's torso but did not hit vital organs. Mehmet had already been convicted of murdering a Turkish Newspaper editor but had escaped after six months.
X6Rr TIL that the developers of Star Wars: The Force Unleashed hoped that George Lucas would give Vader’s apprentice a Darth moniker. Lucas agreed and offered up two Darth titles to choose from; ‘Darth Icky’ and ‘Darth Insanius.’ People waited for George to say ‘just kidding,’ but it never came.
BgZAD TIL Upon returning to Earth, Apollo 11 astronauts went on a 38-day around the world goodwill tour, visiting 29 cities in 24 countries, at the request of President Nixon. They wanted to emphasize that the Moon landing was done for humanity, not just for Americans