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A term coined by Michael Stevens of Vsauce, Boil-o is an invisible, undetectable, unverifiable/unfalsifiable substance that appears whenever things begin to boil. While, yes, the phenomenon of boiling is perfectly explained without Boil-o, Boil-o is still there. Boil-o is used as an example of redundancy. If a phenomena is perfectly explained without something, why include the something?
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