Good for you if you think a porous piece of fabric is actually going to do a lot of good. If people think the virus is THAT contagious and deadly, they should probably just stay home and cower under ...

Masks are sold in front of a bag store in the Ameyoko shopping street in Ueno, in Tokyo's Taito Ward, on April 22, 2020. The proprietor says the store buys the masks from wholesalers that sell bags.

Gas masks worn by military and terrorists in movies are used to protect people from polluted air and toxic gases. In the same way, ordinary masks with advanced filters can also block toxic gases, but ...

Paul Hunter consults for the World Health Organization. He receives funding from National Institute for Health Research and has received funding from the World Health Organization and the European ...