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Anchor lead: Why does air pollution reduce life expectancy? Elizabeth Tracey reports How does air pollution impact life expectancy? A recent study suggests exposure to air pollution may be a major factor accounting for differences in life expectancy among residents …

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Anchor lead: Will testing saliva for Covid-19 replace nasopharyngeal swabs? Elizabeth Tracey reports Testing saliva for Covid-19 has multiple advantages over the gold standard nasopharyngeal swab, two new studies report. Brian Garibaldi, a critical care medicine expert at Johns Hopkins, …

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