Hi Doug, thanks for including my article on contact tracing in your round-up. All of the articles I publish on Medium are also available at sheribyrnehaber.com for free with an annoying "please sign up so I can tell you when my book is finally orderable from Amazon" dialog. The article on contact tracing is at https://sheribyrnehaber.com/why-covid-19-contact-tracing-apps-must-be-accessible/