The Washington Post is providing this news free to all readers as a public service. Follow this story and more by signing up for health, science, and environment email alerts. On Friday, President ...

What fabrics should these three layers be made of? According to the Public Health Agency of Canada, two layers should be made of cotton or linen (or any tightly woven fabric) and the third should be a ...

While each product featured is independently selected by our editors, we may include paid promotion. If you buy something through our links, we may earn commission. Read more about our Product Review ...

Wearing a used mask could be more dangerous than not wearing one at all when it comes to warding off COVID-19, a new study has found. A new three-layer surgical mask is 65 percent efficient in ...