NPR's Ailsa Chang talks with Emily Kwong and Regina Barber of Short Wave about the fluid dynamics of crowds, an early fossil of a modern bird and new data on how people's moods change through the day.

NPR's Ailsa Chang speaks with Jake Johnston, a Haiti aid expert, about what USAID support has meant to that country and what a funding halt could mean.

NPR's Up First is the news you need to start your day. The three biggest stories of the day, with reporting and analysis from NPR News — in 10 minutes. Available weekdays at 6:30 a.m. ET, with ...

The House DOGE subcommittee has found its first targets: NPR and PBS. In letters sent to both media organizations on Monday, Republican Rep. Marjorie Taylor Greene, the chairwoman of the House ...

NPR's Sacha Pfeiffer has details on who they are and where they are being held, exactly. Hi, Sacha. SACHA PFEIFFER, BYLINE: Hi, Ailsa. CHANG: OK, so how many migrants are there already at this point?

In Washington today, protesters gathered outside the office of the U.S. Agency for International Development, or USAID. They were there to object to the so-called Department of Government ...

All right. Yeah, I know it's Super Bowl week, but we're going to talk basketball for the next few minutes because here were some of the initial reactions over the weekend to the blockbuster trade ...

NPR's Ailsa Chang talks with Nancy Krieger, a social epidemiologist at Harvard University, about her efforts to preserve federal health data that recently disappeared from government websites.

NPR's Ailsa Chang talks with Jennifer Herricks, the founder of Louisiana Families for Vaccines, a group that organized a letter asking Sen. Bill Cassidy to denounce RFK Jr.'s HHS nomination.

OK, we want to turn now to focus a bit more on that key vote from Republican Senator Bill Cassidy of Louisiana. As we know, Cassidy is a medical doctor, and he raised deep concerns last week about ...