Contact tracing is key to containing and controlling the spread of a virus in a pandemic. South Korea, China, and Singapore were among the few countries that quickly employed contact tracing after the emergence of COVID-19; the United States did not. In People Count, cybersecurity expert Susan Landau offers an accessible examination of the technology and efficacy of contact tracing in a pandemic. Can we repurpose the tracking technology that we carry with us--devices with GPS, Wi-Fi, Bluetooth, and social media connectivity--to serve public health in a pandemic?