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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.

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.

Harris is the first woman, the first Black person and the first Asian American elected vice president of the United States. Her rise marks a statement about a changing nation.

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 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.

Watch as experts on income inequality discuss a recent NPR poll that is notable for capturing the views of the top 1% of earners in America. The webcast will be livestreamed at 12 p.m. ET Monday.

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.

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.