A century before COVID, a doctor came up with the idea of using face masks to stop a deadly plague in China.
from WebMD Healthhttps://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/article_thumbnails/news/2020/08_2020/first_modern_medical_face_masks/1800x1200_first_modern_medical_face_masks.jpg https://ift.tt/2EGEazO
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