https://techcrunch.com/2020/04/20/academics-contact-tracing/ > Hundreds of academics across the world have welcomed efforts to introduce privacy-friendly contact tracing systems to help understand the spread of coronavirus. > A letter, signed by nearly 300 academics and published Monday, praised recent announcements from Apple and Google to build an opt-in and decentralized way of allowing individuals to know if they have come into contact with someone confirmed to be infected with COVID-19.