WASHINGTON, November 10, 2020 -- If you have seen someone wandering around the grocery store or elsewhere with a mask with a valve on it and wondered how safe it is for you, you were right to be ...

A new study using lasers suggests that face shields and masks outfitted with an exhaust valve aren’t particularly great at protecting others from tiny respiratory droplets containing contagious germs ...

You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. Follow Gabby Landsverk Every time Gabby publishes a story, you’ll get an alert straight to your inbox!

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 ...