Scientists estimate that near-universal mask use could make a major difference in bringing down coronavirus infections in the United States.

NEW ORLEANS, LOUISIANA – JULY 14: Visitors walk past face mask signs along Decatur Street in the French Quarter on July 14, 2020 in New Orleans, Louisiana. Louisiana Gov. John Bel Edwards issued three new restrictions for Phase II of reopening that will be in place until at least until July 24 across Louisiana to help prevent the spread of COVID-19. Restrictions include mandatory mask or face covering outside of the home for those eight years old and older, bars will be closed unless providing curbside pickup, and indoor social gatherings are to be limited to 50 people. (Photo by Sean Gardner/Getty Images)