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TIL of Russia's "Dead Hand" (aka "Perimeter") automated nuclear defense system. If a large spike in radiation levels was picked up within Russian borders (indicating nuclear detonation), the system would target many different cities and launch nukes. It is believed to still be active.

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v177K TIL that Whitney Houston's performance of The Star Spangled Banner - widely regarded as the greatest of all time - was not live, but pre-recorded. She sang into a dead microphone and audiences at home were fed the pre-taped track.
wxwJ TIL In the opening sequence of the Simpsons, when Marge accidentally scans her baby Maggie, the price reads “847.63”, which was the average cost of raising a baby at the time
OGy6g TIL the Myers-Briggs personality test was made by two women without any formal education in the field of Psychology, most of the research supporting its validity come from the Myers-Briggs foundation, and it is widely considered to be just pseudo-science in accademic circles.
4XaE5 TIL that actor Ed O'Neill, famous for his role as TV's Al Bundy, was signed as an undrafted free agent by the Pittsburgh Steelers in 1969. He was cut in training camp.
PY15V TIL University of Michigan researchers discovered that couples who drank together reported negative attitudes toward their marriage. But the same study found that when one partner drank while the other abstained, marital dissatisfaction spiked.