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Beginning in the 1960s, mercury used in the bleaching process at a Dryden, Ont., pulp and paper mill was simply being flushed into the Wabigoon River system.
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In the 1970s, Japanese scientists that visited northwestern Ontario found people suffering from the same symptoms — numbness in the limbs, blurred vision, slurred speech or tremors. Over 40 years later, Hanada told CBC News that "90 to 95 per cent of the population have the same problem. For them it is normal, but for us who do the research it is not normal."
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mercury pollution from a pulp and paper mill poisoned hundreds of kilometers of waterways in northwestern Ontario.