Why do we nod our heads yes and shake our heads no?
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There are varying theories as to why head shake is so frequently used to mean "no". ... Darwin wrote to missionaries in many parts of the world asking for information on local gestures, and concluded that shaking head for "no" was common to many different groups. The gesture is possibly ancient in origin.
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To indicate acceptance
Different cultures assign different meanings to the gesture. Nodding to indicate "yes" is widespread, and appears in a large number of diverse cultural and linguistic groups. ... This nod commonly also includes a very slight, almost unnoticeable, turn of the head to the left (or to the right).
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