- Best fabrics for homemade masks are cotton, natural silk and chiffon, according to study from U. of C., Argonne
- https://www.chicagotribune.com/coronavirus/ct-life-study-fabric-coronavirus-0424-tt-20200424-vu7hdrgfojfutm6c4jpy3ajsv4-story.html
- Mask makers cope with unexpected COVID-19-related shortages as sewing machine demand jumps.
- https://www.chicagotribune.com/coronavirus/ct-coronavirus-face-masks-elastic-shortages-20200425-cuh2orzfnvesda4xha4mi7lp6i-story.html
- Kroger requiring employees to wear face masks to help slow spread of COVID-19
- https://www.kentucky.com/news/coronavirus/article242304181.html
- Israeli Firm Raises $5 Million for Tech to Recognize Mask-Covered Faces
- https://www.nytimes.com/reuters/2020/04/26/business/26reuters-health-coronavirus-facial-recognition.html?searchResultPosition=4
- Coronavirus Symptoms and How to Protect Yourself: What We Know
- https://www.wsj.com/articles/what-we-know-about-the-coronavirus-11579716128?mod=searchresults&page=1&pos=1