Popular Mechanics 6 min video microdroplets COVid19 Apr 8, 2020 20:53:52 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by mary on Apr 8, 2020 20:53:52 GMT laser photography I believe was used. Best between 3 mins and end I thoughtwww.popularmechanics.com/science/health/a32033636/talking-micro-droplets-coronavirus/