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Dear Nigel Begg,
Your question assumes that human language got going only once, in one place, in the history of our species; we don't know for sure whether or not that is true but I think it's fair to say that the consensus leans towards it not being true, and that language probably emerged independently at many places on the globe. Whether that is so or not, I think it would hardly be possible that language could have spread from New Guinea to the rest of the world, because I believe that biological genetics research makes it pretty certain that New Guinea, Australia, and the Pacific islands were populated from Eurasia, the population didn't spread in the other direction.
Regards,
Geoffrey Sampson
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