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States aren't getting nearly as much federal money this year to explain and campaign for Affordable Care Act policies. Some are trying to make up the shortfall; others lack the cash or political will.

New software the companies plan to add to phones would make it easier to use Bluetooth wireless technology to track down people who may have been infected by coronavirus carriers. The idea is to help national governments roll out apps for so-called “contact tracing” that will run on iPhones and Android phones alike.

For children in developing countries, cancer care is largely out of reach. But new research is challenging assumptions that it's too costly and complicated.

The Trump administration tried and failed to accomplish a long-held desire of immigration hard-liners — a count of unauthorized immigrants to reshape Congress, the Electoral College and public policy.

The trash was piling up in the gutter. A young man in Nigeria wanted to get local kids to help clean it up. His campaign has gone viral.

As the virus makes copies of itself, errors may creep in, changing its genetic makeup. Researchers are trying to determine if the changes are significant.

The blood test detects who may have been infected, without experiencing any symptoms, and recovered from the virus that causes COVID-19.

San Diego voters should brace themselves for a high-dollar contest this November when they’ll be asked to decide between two competing stadium measures to transform prime city-owned real estate in Mission Valley.

San Diego Unified School District officials announced Monday they were making preparations to get children back in schools, but were looking at a timeline of "months, not weeks," before that could become a reality.

Before going public, data scientist Christopher Wylie helped the now defunct company figure out how to target people online. In a new memoir, he offers details of the project and the players.