People Count

An introduction to the technology of contact tracing and its usefulness for public health, considering questions of efficacy, equity, and privacy. How do you stop a pandemic before a vaccine arrives? Contact tracing is key, the first step in a process that has proven effective: trace, test, and isolate. Smartphones can collect some of the information required by contact tracers--not just where you've been but also who's been near you. Can we repurpose the tracking technology that we carry with u