“However, N95 masks are uncomfortable to wear for long periods of time, need to be fitted and are quite expensive,” Winslow explains. “In contrast, surgical procedure masks are inexpensive ...

Dr. Wu Lien-teh invented an early form of the filtered surgical mask in 1910. Credit: google In its latest homepage Doodle, Google celebrates what would be the 142nd birthday of Dr. Wu Lien-teh ...