In makeshift home laboratories, a team of scientists discovered that cotton flannel is the optimal fabric, and their latest study says that the moisture from our breath makes the mask more effective.

Eugenia O’Kelly does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

Five months after coronavirus took root in the U.S., face masks remain one of the most controversial and confusing parts of the pandemic. Changing public-health messaging hasn’t helped. In March, when ...