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Thanks Ray, but is it testable? And if so how? Someone has to tell those in authority in China that it is a serious hypothesis and only they are in a geographical position to test it, by finding the location of the glass mine that is still open. And that the economic stakes for them are high. Personally I find it a plausible hypothesis, and once they having found the glass mine(s) (which would cost nothing but that of a few modest bribes and promises of collaboration), if it fits they can go to work on the craters (which would cost more, even tho' we know exactly where they are, because any hard local evidence of impact will have been obscured by subsequent volcanism). And they need to recognise that it would capture their own public's imagination, such being of critical important to politicians the world over.