observed curves:
https://ichef.bbci.co.uk/news/624/cpsprodpb/15699/production/_113150778_optimised-excess_100k-faisal-nc.png
  https://www.bbc.com/news/business-53222182  UK hardest hit by virus among leading G7 nations
  https://ichef.bbci.co.uk/news/624/cpsprodpb/18410/production/_113144399_us_cases_texas-nc.png
  https://ichef.bbci.co.uk/news/660/cpsprodpb/6A58/production/_113142272_optimised-us_cases_deaths_29jun-nc.png

by state:
https://ichef.bbci.co.uk/news/624/cpsprodpb/C7B7/production/_113172115_optimised-us_pos_case-nc.png
https://www.npr.org/sections/health-shots/2020/07/01/885263658/green-yellow-orange-or-red-this-new-tool-shows-covid-19-risk-in-your-county
  Danielle Allen, a professor and director of Edmond J. Safra Center for Ethics at Harvard University
  https://globalepidemics.org/key-metrics-for-covid-suppression/


Image: Drew Harris

https://images.fastcompany.net/image/upload/w_596,c_limit,q_auto:best,f_auto/wp-cms/uploads/2020/03/i-7-90474434-the-best-sources-for-tracking-covid-19-according-to-mapping-experts.jpg

https://images.fastcompany.net/image/upload/w_596,c_limit,q_auto:best,f_auto/wp-cms/uploads/2020/03/
    i-7-90474434-the-best-sources-for-tracking-covid-19-according-to-mapping-experts.jpg

https://twitter.com/drewaharris/status/1233267475036372992?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1233267475036372992&ref_url=https%3A%2F%2Fwww.fastcompany.com%2F90476143%2Fthe-story-behind-flatten-the-curve-the-defining-chart-of-the-coronavirus

https://images.fastcompany.net/image/upload/w_596,c_limit,q_auto:best,f_auto/wp-cms/uploads/2020/03/i-5-cdc-orig-90474434-the-best-sources-for-tracking-covid-19-according-to-mapping-experts.jpg

https://images.fastcompany.net/image/upload/w_596,c_limit,q_auto:best,f_auto/wp-cms/uploads/2020/03/i-6-90474434-the-best-sources-for-tracking-covid-19-according-to-mapping-experts.jpg

https://images.fastcompany.net/image/upload/w_596,c_limit,q_auto:best,f_auto/wp-cms/uploads/2020/03/
      i-5-cdc-orig-90474434-the-best-sources-for-tracking-covid-19-according-to-mapping-experts.jpg

https://images.fastcompany.net/image/upload/w_596,c_limit,q_auto:best,f_auto/wp-cms/uploads/2020/03/
      i-6-90474434-the-best-sources-for-tracking-covid-19-according-to-mapping-experts.jpg

https://www.fastcompany.com/90476143/the-story-behind-flatten-the-curve-the-defining-chart-of-the-coronavirus
www.nytimes.com/2020/03/11/science/coronavirus-curve-mitigation-infection.html