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| 2020 (April 27) || {{w|Coronavirus disease 2019}} || Policy || Face masks become mandatory for shopping and in public transportation in Germany.<ref name="Fangerau">{{cite journal |last1=Matuschek |first1=Christiane |last2=Moll |first2=Friedrich |last3=Fangerau |first3=Heiner |last4=Fischer |first4=Johannes C. |last5=Zänker |first5=Kurt |last6=van Griensven |first6=Martijn |last7=Schneider |first7=Marion |last8=Kindgen-Milles |first8=Detlef |last9=Knoefel |first9=Wolfram Trudo |last10=Lichtenberg |first10=Artur |last11=Tamaskovics |first11=Bálint |last12=Djiepmo-Njanang |first12=Freddy Joel |last13=Budach |first13=Wilfried |last14=Corradini |first14=Stefanie |last15=Häussinger |first15=Dieter |last16=Feldt |first16=Torsten |last17=Jensen |first17=Björn |last18=Pelka |first18=Rainer |last19=Orth |first19=Klaus |last20=Peiper |first20=Matthias |last21=Grebe |first21=Olaf |last22=Maas |first22=Kitti |last23=Bölke |first23=Edwin |last24=Haussmann |first24=Jan |title=The history and value of face masks |doi=10.1186/s40001-020-00423-4 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7309199/}}</ref> || {{w|Germany}} || [[File:FFP1 face mask, 2020 (cropped).jpg|thumb|center|150px|FFP1 face mask, 2020]]
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| 2020 (November 24) || || Research || A study by the {{w|American Institute of Physics}} finds that if 70% of people wore surgical masks, the pandemic would be "eradicated."<ref>{{cite journal |last1=Kumar |first1=Sanjay |last2=Lee |first2=Heow Pueh |title=The perspective of fluid flow behavior of respiratory droplets and aerosols through the facemasks in context of SARS-CoV-2 |doi=10.1063/5.0029767 |url=https://aip.scitation.org/doi/full/10.1063/5.0029767}}</ref><ref>{{cite web |title=Pandemic could be 'eradicated' if 70% of people wore surgical masks, researchers say |url=https://www.abcactionnews.com/news/national/coronavirus/pandemic-could-be-eradicated-if-70-of-people-wore-masks-researchers-say?fbclid=IwAR2TWP5fVV_twmz78MJILFUHwzXcsSaZmZWVGEdF8hYWZ8ZQgR5i2PaSP8M |website=abcactionnews.com |access-date=29 November 2020}}</ref>
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| 2020 || || Research || Research reports on the possibility of the N95 respirator mask to be sterilized by hanging it in the oven by using a wooden clip.<ref name="Bhartendua"/> ||
