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The African and South American lung fishes possess 4 pairs of feathery external gills
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A bed net designed to kill insecticide-resistant mosquitoes could prevent millions of cases of malaria across sub-Saharan Africa, scientists have found.A two-year clinical trial in Burkina Faso showed that dousing bed nets with a combination of chemicals resulted in a 12% reduction in clinical malaria cases, compared with conventional bed nets
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