Evolution implies that these muscles are less important, presumably because we have more effective ways of expression.
We have less expressive faces than prior human species: muscles for disdain, sadness, smile & aggression r smaller. http://biorxiv.org/content/biorxiv/early/2016/09/01/072884.full.pdf …
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A complex multi stage infection mechanism, running on information encoded in moleculeshttp://youtu.be/HhhRQ4t95OI
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Evolution? Or less awareness?
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