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  • Martin Greenberg thinks this is interesting:

We should briefly note the common problem Westerners have with the Indian head gesture for “yes.” For many Indians, especially in the southern half of the country, this gesture is a kind of head wobble or bobbing motion, tilting but not turning the head to one side and then tilting it to the other, that looks very much like the way Westerners shake their head to indicate “no.”