If you’re wearing a face mask with a little plastic valve embedded in it, you should know that valves compromise the effectiveness of the mask—and this is true whether your mask is a hardware-store ...

Forbes contributors publish independent expert analyses and insights. I write about the brain and the body but sometimes other things. New videos show how the N95 masks with an exhalation valve ...

In some states and major cities, it’s now mandatory to wear a mask in public to prevent the spread of COVID-19. That mask could be anything from a handkerchief to a designer cotton mask to a ...

LOS ANGELES - Until a coronavirus vaccine is made widely available, social distancing measures like avoiding large crowds, proper hand-washing techniques and wearing facial coverings are the best ...

You might not know it, but the N95 respirator actually has a close cousin. One variation of the mask has an exhalation valve right in front of the mouth. It’s a one-way trip for airflow. When you ...

Tank-automotive and Armaments Command recently changed its cloth face mask requirements to exclude those masks with exhalation valves. This means that face masks with exhalation valves will no longer ...

Scientists have used high-speed videos of air flow to show why masks with exhalation valves do not slow the spread of Covid-19. The study revealed that the droplets escape unfiltered through the valve ...

Using high-speed video and schlieren imaging, a research engineer has created videos that show how air flows through masks with and without exhalation valves. Many people wear masks in public to slow ...

Many people wear masks in public to slow the spread of COVID-19, as recommended by the Centers for Disease Control and Prevention (CDC). However, masks with exhalation valves do not slow the spread of ...