With doctors, nurses and other health workers face an acute shortage of protective masks, Food and Drug Administration announced on Friday that it would allow more use of masks available that meet the standards of China is not the American people. Hospitals throughout the United States ran out of N95 masks, which filter out at least 95 percent of particles 0.3 microns or larger, including a new coronavirus. N95 masks are tested and certified by the National Institute for Occupational Safety a...