Peleg speculates that genes might influence the muscle and nerve structure in the face. This, in turn, would create biological constraints that make facial expressions more similar among relatives.
Stay on topic. Be polite. Use facts and arguments. Be Brief. Do not post back to back comments in the same thread, unless you absolutely have to. Don't quote excessively. Google before you ask.
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Stay on topic. Be polite. Use facts and arguments. Be Brief. Do not post back to back comments in the same thread, unless you absolutely have to. Don't quote excessively. Google before you ask.