evidence: Another study looked at coronavirus deaths across 198 countries and found that those with cultural norms or government policies favoring mask-wearing had lower death rates. [...] Masks may be more effective as a "source control" because they can prevent larger expelled droplets from evaporating into smaller droplets that can travel farther. [...] The latest forecast from the Institute of Health Metrics and Evaluation suggests that 33,000 deaths could be avoided by October 1 if 95 percent of people wore masks in public.