/u/kempff's posts in /r/askscience
If the sun's emission spectrum is made up of discrete lines then why do rainbows (e.g. made by glass prisms) appear to be continuous?
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If coal, oil, and natural gas are made from ancient plants and animals, and if these substances are primarily hydrocarbons, then what happens to the nitrogen, oxygen, calcium, etc., that used to make up the various chemical substances fossil fuels originally come from?
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Which would keep your gravy warmer longer? A spoon filled with hot water or a spoon with an iron core?
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