![A study finds that if the U.S. had introduced a uniform national mask mandate for employees of public-facing businesses on April 1, the number of deaths in the U.S. would likely have been 40 percent lower on June 1.](https://idss.mit.edu/wp-content/uploads/2020/07/MIT-Masks-Work-01_0.jpg)
Causal impact of masks, policies, and behavior on the early spread of Covid-19
MIT News | August 5, 2020
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