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[–] wincest1 ago 

Just like rats.

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[–] mralexson [S] 0 points 1 point (+1|-0) ago  (edited ago)

Their birth rate weren’t particularly higher than europeans. The Chinese irrigated massive river systems(Yellow and Yangtze) and discovered a primitive form of immunization called variolation https://en.m.wikipedia.org/wiki/Variolation