A KAIST research team announced that they have developed a nano-filter that maintains excellent filtering efficiency even after hand washing through the development of proprietary technology that aligns nanofibers with a diameter of 100~500 nm in orthogonal or unidirectional directions. https://nano-magazine.com/news/2020/3/18/reusable-nano-filtered-face-mask-could-relieve-covid-19-supply-issues?ss_source=sscampaigns&ss_campaign_id=5e73c0488882da6a17a9092e&ss_email_id=5e74713236d8ef7d57f8cbb6&ss_campaign_name=Rapid+coronavirus+test+promises+to+ease+strain+on+healthcare+systems&ss_campaign_sent_date=2020-03-20T07%3A33%3A44Z