CNN Anderson Cooper 360 December 24, 2021 05:55:00
Even in people who passed through the area after the infectious person had already left. it's all part of why the cdc still insists on keeping your distance from others while traveling and wear a high quality mask. our professors tested masks too. and it's easy to see why some experts say cloth masks and anything that's just a single layer offers so little protection. first we tested a single layer gaiter. >> it tends to let anything through without any stoppage. >> reporter: next up, a single layer bandanna made of 100% cotton. >> this is cotton, one layer. it performs a little better than th...
Source: archive.org