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The emergence of COVID-19 started scientists on a yearlong crash course to learn how the coronavirus might travel through the air and how to stop it. They learned a lot, and quickly.
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Nurses say COVID-19 patients have sometimes been housed in the same units as uninfected patients. While officials have penalized nursing homes for such failures, hospitals have seen less scrutiny.
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Simply talking could produce tiny particles of mucus and saliva that might carry the coronavirus, experts say. How much these airborne particles matter for the spread of this disease is controversial.