In two major COVID-19 developments today, the World Health Organization (WHO) updated its mask guidance, urging countries with widespread transmission to encourage mask use in situations where physical distancing isn't possible, and researchers from the United Kingdom stopped a large hydroxychloroquine trial after no benefit was found in hospitalized patients.Today the global total climbed to 6,703,686 cases, and 393,383 people have died from their infections, according to the Johns Hopkins online dashboard.Mask guidance for clinical settings, at-risk people, general publicAt a media briefing today, WHO Director-General Tedros Adhanom Ghebreyesus, PhD, said the updated guidance has three main changes, plus new information on the