The head of the U.S. Centers for Disease Control and Prevention, Robert Redfield, says contact tracing will be vital in the next phase of the coronavirus pandemic in the United States. Poor countries ...

Experts believe that at least half the population needs to use contact-tracing apps for them to work. The challenge will be convincing the public to opt in after years of trust issues with big tech.

The news: Digital contact tracing apps have faced a wide range of difficulties, but that doesn’t mean we should abandon the idea, according to the authors of a new essay in the journal Science.