Why we wear masksand the N95 is a good one, Part 2
One might imagine\xa0that face masks work\xa0because the multiple layers will stop a virus\xa0getting through. But no, that's not it\u2014they use a high-tech 'melt-blown' material, developed from a technique first noticed in volcano eruptions.
Host: Dr Karl Kruszelnicki
Producer: Diane Dean