Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Condoms were originally made of animal intestines or linen.
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The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
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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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