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TIL when Chuck Peddle & Bill Mensch introduced the 6502 microprocessor at a trade show in 1975, it was faster & cheaper than its competitors ($25 each instead of nearly $200). It almost single-handedly forced the price of processors to drop, helping to launch the personal computer revolution.

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MrvB TIL in the 1980s a man with severe OCD shot himself in the head in an attempt to commit suicide. Instead of killing him, the bullet destroyed the part of his brain that was responsible for his OCD, and he went on to become a straight-A college student five years later.
X0wJ8 TIL about the liking gap, which is that people you meet like you more than you think. Psychologists found that "people systematically underestimated how much their conversation partners liked them and enjoyed their company."
b9D7a TIL that some people don't have an inner internal monologue.
M7G87 TIL That while some citric acid is derived from lemon juice, the majority of citric acid commercially sold is extracted from a black mold called Aspergillus niger, which produces citric acid after it feeds on sugar
E1GvP TIL Batman: The Animated Series was ranked by IGN as being the second best animated series ever, behind only The Simpsons