Efficacy of Facemasks against Covid19

Sars 2 Covid is spread from person to person with a high rate of transmission through an aerosol projection (breath) a mask provides deflection of this event and reduces the time of exposure, an average exposure rate is now an estimated 15 minutes, previously thought to be in hours. If humans can go to the hospital and not understand all the machines, gadgets, microscopes and medical staff who practice scientific values to save lives, then it is possible to look at a small piece of this amazing world through this zoom conference that can introduce such complexity in an understandable, non political, and intellectual manner of helping humans survive. TWIV This Week in Virology. a weekly update of world doctors, looking down microscopes. https://youtu.be/ontnaTFchXo