"Fish odor syndrome" is a rare genetic disorder that causes people to smell like rotten fish.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Australian Graham Barker has been collecting his own belly button fluff every day since 1984 - keeping it in storage jars.
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The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
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The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
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