LOS ANGELES -- It all started with a father-and-son team and two 3D printers as they made masks. Then, the community helped them out. They now have 17 printers to make dozens of masks daily. "When I ...

For months, scientists have been saying masks reduce transmission of COVID-19. They now think masks can also make the illness less severe. The reason is the barrier created by a mask likely limits the ...

I spent my career working with microfibres, which have a diameter of 2 micrometres or so. Tangled mats of microfibres made of polypropylene are good materials for air filters — such as those in N95 ...