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TIL while Richard Nixon was on a trip to the Soviet Union in 1959, high levels of radiation were detected the room he was staying in. Secret Service purposely argued about the radiation and how to handle it in an area they knew the Soviets had bugged. Three hours later, the radiation disappeared.

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via reddit.com

Wkv9Y TIL in 1821, a British ship shipwrecked on Inaccessible Island, part of the most remote island group in the world. For over 4 months the passengers survived on wild celery and animals and built a boat. The 1st boat failed, but they built another and sailed to South Africa. Only 8 of the 54 died.
BrMyD TIL that the most accurate simulation of the human brain ever has been carried out, but a single second’s worth of brain activity took one of the world’s largest supercomputers 40 minutes to calculate.
wL4xP TIL while many depictions of a heart attack include collapsing or loss of consciousness, these actually aren't common symptoms of it in real life. This causes frequent misunderstanding of the issue and improper care for heart attack sufferers.
8WLX TIL of Scott E. Parazynski, the only person to have flown in space and summited Mount Everest. Parazynski flew five times in the Space Shuttle and conducted seven spacewalks. In 2008, he failed to summit Everest due to a severe back injury, but succeeded on his second try the next year.
1aQpr TIL Charles Manson studied 150 hours of Scientology before deciding the religion was "too crazy" for him.