ChatterBank2 mins ago
Hand Gestures
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Why do we wave our hand when saying hello or goodbye
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For more on marking an answer as the "Best Answer", please visit our FAQ.Before vocal or written language even existed, humans needed a way to communicate their ideas and feelings, and gesturing is the easiest way to go about this problem. Now, since the advent of language, the innate desire to use one's hands still exists, even though it is not necessary to do so all of the time.