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jianyun Lu, Jieni Gu, et al. "COVID-19 Outbreak Emerging Infectious c.cdc.gov Emerging Infectious Diseases. 2021;27(5):1274. navirus Getting Better at Times, Oct 1, 2021, https://www.nytimes.com ork Times, Feb. 13, 2020, https:/(www.nytimes.com. And Wudan Yan, New ytimes.com. ua Hendrix, Charles Walde, Kendra rbidity and Mortality Weekly Report, 2020;69:930-932. sal lity Weekly Report 21 "At a restaurant in Guangzhou, China": Jianyun Lu, Jieni Gu, et al. "COVID-19 Outbreak Associated with Air Conditioning in Restaurant, Guangzhou, China, 2020." Emerging Infectious Diseases, 2020;26(7):1628. https://wwwnc.cdc.gov 22 "In Christchurch, New Zealand": Nick Eichler, Craig Thornley, Tara Swadi, et al. "Transmission of Severe Acute Respiratory Syndrome Coronavirus 2 during Border Quarantine and Air Travel, New Zealand (Aotearoa)." Emerging Infectious Diseases. 2021;27(5):1274. https://wwwnc.cdc.gov 23 "And for a time, at least": Apoorva Mandavilli, "Is the Coronavirus Getting Better at Airborne Transmission?," New York Times, Oct 1, 2021, https://www.nytimes.com 24 "One study used a computer simulation": Rommie Amaro et al., "#COVIDisAirborne: AI-Enabled Multiscale Computational Microscopy of Delta SARS-CoV-2 in a Respiratory Aerosol," Nov 17, 2021. https://sc21.supercomputing.org 25 "It dates from": Christos Lynteris, "Why Do People Really Wear Face Masks During an Epidemic?" New York Times, Feb. 13, 2020, https://www.nytimes.com. And Wudan Yan, "What Can and Can't Be Learned From a Doctor in China Who Pioneered Masks," New York Times, May 24, 2021, https://www.nytimes.com. 26 "For many people who were following": M. Joshua Hendrix, Charles Walde, Kendra Findley, Robin Trotman. "Absence of Apparent Transmission of SARS-CoV-2 from Two Stylists After Exposure at a Hair Salon with a Universal Face Covering Policy -- Springfield, Missouri, May 2020." Morbidity and Mortality Weekly Report, 2020;69:930-932. 27 "One research team": Siddhartha Verma, Manhar Dhanak, and John Frankenfield, "Visualizing the effectiveness of face masks in obstructing respiratory jets", Physics of Fluids 32, 061708 (2020) 28 "Another group of researchers": John T. Brooks et al. "Maximizing Fit for Cloth and Medical Procedure Masks to Improve Performance and Reduce SARS-CoV-2 Transmission and Exposure, 2021." Morbidity and Mortality Weekly Report, vol. 70, no. 7, Feb. 2021, pp. 254-57.