In an interview for 60 Minutes, CBS News chief medical correspondent Dr. Jon LaPook posed that question to Linsey Marr, a Virginia Tech University professor specializing in aerosol science.

“They are very helpful in reducing the chances that the person will get COVID because it’s reducing the amount of virus that you would inhale from the air around you,” Marr said about masks.

No mask is 100% effective. An N95, for example, is named as such because it is at least 95 percent efficient at blocking airborne particles when used properly. But even if a mask has an 80% efficiency, Marr said, it still offers meaningful protection.

“That greatly reduces the chance that I’m going to become infected,” Marr said.

Marr said research shows that high-quality masks can block particles that are the same size as those carrying the coronavirus. Masks work, Marr explained, as a filter, not as a sieve. Virus particles must weave around the layers of fibers, and as they do so, they may crash into those fibers and become trapped.

Marr likened it to running through a forest of trees. Walk slowly, and the surrounding is easy to navigate. But being forced through a forest at a high speed increases the likelihood of running into a tree.

“Masks, even cloth masks, do something,” she said.

Not that I expect most people to believe it at this point…

  • @YoBuckStopsHere
    link
    English
    -101 year ago

    It was the worst public safety decision I have witnessed in the United States. It made a bad situation worse.

    • @T00l_shed
      link
      21 year ago

      The issue is not with lock downs, the issue is a piss poor government handling of the situation. Leaving everything “open” for business would have quite literally collapsed sectors of services to the point of potentially snow balling into something worse.

      • @YoBuckStopsHere
        link
        English
        -51 year ago

        Everything should have remained open within countries, international borders should have closed for six months. International ports could operate with certain restrictions to prevent cross contamination.

    • ASeriesOfPoorChoices
      link
      11 year ago

      Because it was badly done in the USA. Half-assed.

      Do it properly, and it worked well.