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TIL that whales have inverted nipples and produce milk so fatty it has the same texture as toothpaste.

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wLwE TIL A professor died from from dropping a few drops of a substance called Dimethylmercury on her glove when conducting an experiment.
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XEGVk TIL Rachmaninoff created a piece based on an inversion of the melody of a Paganini's theme, by flipping the melody "upside-down", reversing its contour, so (almost) all the rising parts become falling parts.
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kOjx7 TIL Arlington National Cemetery includes Arlington House, a Memorial to Robert E Lee