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  1. Stephen Petty: Facemasks are the last thing you should do to protect from a virus

    Stephen Petty: Facemasks are the last thing you should do to protect from a virus

    40
  2. Stephen Petty (Industrial Hygienist): Ventilation is far better than Facemasks to control Aerosols

    Stephen Petty (Industrial Hygienist): Ventilation is far better than Facemasks to control Aerosols

    74
  4. Kristen Meghan, Industrial Hygienist- Masks DO NOT WORK for COVID

    Kristen Meghan, Industrial Hygienist- Masks DO NOT WORK for COVID

    149