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tk hara, Paul Schrimpf, "The ional Academy of Sciences Oct 2021: 118. Proceedings of the National , Aug 2020: 19658-1966.0 iked Questions about Estimated Flu y many countries failed at COVID contacthttps://www.nature.com. 4 "Between March 2020 and June 2021": UNESCO, "School_closures_and_regional_policies_to_mitigate_learning_losses_in_asia_pacific," http://uis.unesco.org. 5 UNESCO. 6 Source tk 7 "In the United States through March 2021": CDC, "Science Brief: Transmission of SARSCoV-2 in K-12 Schools and Early Care and Education Programs - Updated," Dec 2021, https://www.cdc.gov. 8 "One study found that": Victor Chernozhukov, Hiroyuki Kasahara, Paul Schrimpf, "The association of opening K-12 schools with the spread of COVID-19 in the United States: Countylevel panel data analysis," Proceedings of the National Academy of Sciences Oct 2021: 118. https://www.pnas.org/ 9 "One ingenious study used": Weill, Joakim A et al. "Social distancing responses to COVID-19 emergency declarations strongly differentiated by income." Proceedings of the National Academy of Sciences of the United States of America, Aug 2020: 19658-1966.0 10 "Every year, influenza kills": CDC, "Frequently Asked Questions about Estimated Flu Burden," https:/www.cdc.gov. And WHO, "Ask the Expert: Influenza Q&A," https://www.who.int. 11 "According to the journal Nature": Nature, "Why many countries failed at COVID contacttracing -- but some got it right," Dec 14, 2020, https://www.nature.com. 12 "In March 2020": Quach, Ha-Linh, et al. "Successful Containment of a Flight-Imported COVID-19 Outbreak through Extensive Contact Tracing, Systematic Testing and Mandatory