
The Origins of Facial Expressions: How Evolution Shaped Our First Language
A six-week-old baby smiling back at its mother is using humanity's oldest interface. Why are humans the only primates with visible eye whites and over forty facial muscles? From Darwin's 1872 study to Paul Ekman's six universal expressions and Lisa Feldman Barrett's recent rebuttal, this article traces the long argument over whether our faces speak a single language—or many.
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