Watch: How face coverings can slow the spread of disease
https://healthell.blogspot.com/2020/06/watch-how-face-coverings-can-slow.html
Watch: How face coverings can slow the spread of disease
Fluid dynamicist and mechanical engineer at the National Institute of Standards and Technology (NIST), Matthew E. Staymates, illustrates how face coverings can slow the spread of disease.
