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TIL in the 1950's nuclear bomb tests at the Nevada Proving Grounds were often a Las Vegas attraction. You'd be able to see the mushroom clouds and feel the massive seismic shock waves produced by the bombs.

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x6B4B TIL about the Capitol Hill mystery soda machine a vending machine in Capitol Hill, Seattle, notable for its "mystery" buttons which dispensed unusual drink flavors. It is unknown who restocked the machine, which originally caused the development of a local legend that the machine was haunted.
jNYvN TIL Following a traumatic event, a person may develop a sense of a foreshortened future, which is currently considered an avoidance symptom of post-traumatic stress disorder (PTSD). They may also feel as though they won't be able to reach milestones in their life, such as a career or marriage.
EJ9x TIL Leo Szilard conceived the nuclear chain reaction,the nuclear reactor, and wrote the letter suggesting the Manhattan Project, which Einstein signed. After being diagnosed with bladder cancer, he designed his own radiation therapy which led to a full recovery.
4Xavg TIL In 1977, Bill Murray was struggling to make it on Saturday Night Live so much that he delivered an on-air plea for the audience to laugh whenever he said something. In the early going on SNL, Murray, then in his mid-20s, was generally deemed a failure
lonPN TIL a 2011 study showed that a group of 4 year olds had a temporary lapse in cognitive function after watching 9 minutes of SpongeBob