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TIL that difficulty in hearing in noisy places is a real medical condition called"cochlear synaptopathy" or "hidden hearing loss" and it is undetected in most hearing tests.

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nWe7B TIL the Sun is not a mass of incandescent Gas, it’s a miasma of incandescent Plasma
d8X08 TIL the human brain remains half awake when sleeping in a new environment for the first time.
4X9Bo TIL of the Mother of All demos given by Doug Engelbart. The demo talked about all the possibilities of modern computing. A year later the first link on what would be the internet connected UCLA and Stanford.
epKj5 TIL there is an ancient Corinthian helmet in the Museum of Korea. Originally gifted to marathoner Son Gi-Jeong for winning the gold medal in the 1936 Olympics, he did not receive it until 1986. Son then donated it to the museum. It is Korea's only designated Western "National Treasure"
E70X TIL that had JFK not been assassinated, the Soviet Union and the U.S. would have created a Space Union which would have resulted in both the US and the Soviet Union landing on the moon together (at 12:11)