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Birds change the shape of their wings far more than planes. The complexities of bird flight have posed a major design challenge for scientists trying to translate the way birds fly into robots.

The possible election of U.S. Sen. Kamala Harris as vice president has set off a fierce competition in California to replace her. Contenders are already pressuring Gov. Gavin Newsom for what could be a once-in-a-lifetime appointment.

In 13 U.S. cities this summer, volunteers are capturing detailed measurements that will include the heat index people experience. Cities will use the new heat maps to help cool the hottest spots.

From Broadway plays to playwrights giving writing lessons to online courses from Ivy League schools, here's a look at some things (but not everything!) that have suddenly become free.

Residents of one of the world's most polluted cities are getting fed up with government inaction — and a few questionable tweets aren't helping.

The U.S. canceled 1,000 visas given to Chinese students it alleges have ties to the Chinese military. The dramatic step is to counter what officials say is a concerted Chinese espionage effort.

The effort, still in its early stages, hopes to track infections and determine the effectiveness of safety measures.

A century of U.S. statistics finds mortality rates and life expectancy were much worse for Black Americans during pre-pandemic years than they have been for white people during the COVID-19 crisis.

Democrats have descended on the state in the hopes that they pass muster with Iowans. Hear the voices and see the scene in the days leading up to first contest in the 2020 presidential race.

The coronavirus pandemic requires people to weigh risks and make choices about their activities. But there can be problems when a choice conflicts with what the people around us decide to do.