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TIL under suspicion that he might join protests at the republican party convention in 1972, John Lennon was under heavy CIA surveillance. Lennon and his wife were aware they were under surveillance to some degree, but were still shocked once they were informed about the full extent of it

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via reddit.com

5VOjR TIL: Stalin blocked attempts to kill Hitler twice, fearing that his replacement might make peace with the western allies
wLokW TIL when most species of marine mammals are asleep, there is always one hemisphere of their brain that is awake. This allows dolphins, for example, to swim and surface to breathe when they are sleeping. They enjoy the benefits of sleep but still perform many of the same processes done when awake.
b678p TIL that the popularity of Tom Yum and other Thai dishes led to the employment of 120,000 people in Malaysia
GYANQ Dumping all our nuclear waste in a volcano does seem like a neat solution for destroying the roughly 29,000 tons of spent uranium fuel rods stockpiled around the world. But there's a critical standard that a volcano would have to meet to properly dispose of the stuff, explains Charlotte Rowe, a volcano geophysicist at Los Alamos National Laboratory. And that standard is heat. The lava would have to not only melt the fuel rods but also strip the uranium of its radioactivity.
v1KQ7 TIL: On Full House Bob Saget, John Stamos & Dave Coulier often got in trouble for "adult humor" in front of their child co-stars and got busted doing whip its off screen with 15 cans of Redi Whip while impatiently waiting for the girls to finish shooting a scene.