/u/EldestPort's posts in /r/askscience
Is it possible to get a different combination of quarks than uud or udd? Do there have to be three quarks or could you have a combination of, say, two or four? Why/why not?
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Why are propane and butane (and in the past CFCs) popular propellants for aerosols? Are there any other propellants in popular use?
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