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TIL that a pair of headphones, plugged into a microphone jack, will work as a microphone. A microphone will similarly work as a speaker if plugged into the headphones jack. The internal components of the two devices are functionally identical.

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PYLWO TIL Andre 3000 recorded all the vocals for the hit Outkast song "Hey Ya!" Off the top of his head. He also recorded 30-40 takes of each line. His recording engineer said that there about 20 different versions of the song recorded during their sessions together.
d8PWE TIL that an "eggcorn" is a phrase that sounds similar and seems to make sense to another, but has a word incorrectly substituted in (like "Old-Timer's Disease" instead of "Alzheimer's Disease"). It's based on an example of a person saying "eggcorn" instead of "acorn"
MepdV TIL of George Trepal of Polk County Florida. A recluse & an oddball, he poisoned his neighbors, killing the mother, by tampering bottles of Coke with thallium in 1988. He was irritated by loud music & noises by the teenage sons, the reason for doing the poisoning. He is awaiting the death row.
vxV7 TIL that Voltaire saw Canada as being a useless, frozen wasteland and sarcastically referred it as nothing more than “a few acres of snow”.
QNMDk TIL Tipping in the United States became popular in the late 19th Century due to restaurant owners refusing to pay Black workers after the ratification of the 15th Amendment.