The chin, weirdly, is a sign of human mental progress. If you wanted what it did you might want to look at which groups today have large jaws, like say Germanics.
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To this day no has ever answered the simple question: “what is the purpose of the chin”? The most commonly given answer, that it helps to chew, is stupid: masticatory stress was a greater problem 500,000 years ago and yet chins then were poorly developed.
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The true answer….. will be revealed once I finish the Substack Manhattan Project and start making you people pay for all this wonderful stuff.
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Spandrel
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Excellent word, I shall use it
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chin is signal growth like jaw. you have resources to spare other places.
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This argument falls flat, because those resources could be spent anywhere, so why at the chin?
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More pronounced in men, perhaps secondary sexual characteristic. But really I wager is co-evolved with drunk brawls, famously common in the germanic countries of old in cities and villages alike. Beats having a broken jaw.
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Perhaps a display structure?
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Chin development is a good indicator of immune system health during male childhood. It’s plumage to impress females.
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