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ncbi.nlm.nih.gov
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TIL the classic "old people smell" is real and likely caused by a molecule called 2-nonenal, concentrations of which sharply increase in older individuals.
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TIL "borderline personality disorder" was named to describe patients who seemed on the borderline of psychosis
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TIL about 21% of beef in the US comes from culled dairy cows, sold for slaughter at around age 5 when their milk production drops off. This culling increases profitability and so subsidizes the cost of the milk production.