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 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 Ailsa Chang talks with Jennifer Herricks, the founder of Louisiana Families for Vaccines, a group that organized a ...

NPR's Ailsa Chang speaks with Democratic Rep. Jamie Raskin of Maryland about the Trump administration's move to effectively close down the United States Agency for International Development, or USAID.

NPR congressional correspondent Deirdre Walsh joins us now from the Capitol with more. Hi, Deirdre. DEIRDRE WALSH, BYLINE: Hey, Ailsa. CHANG: OK, so what are Republicans saying about Musk’s Department ...

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.

Hi, Sacha. SACHA PFEIFFER, BYLINE: Hi, Ailsa. CHANG: OK, so how many migrants are there already at this point? PFEIFFER: At least one planeload of 10 people so far, and Defense Department photos ...

NPR's Ailsa Chang talks with Jason Gay, a sports columnist for the Wall Street Journal, about the Dallas Mavericks' Luka Doncic, widely considered a once-in-a-generation talent, becoming a Laker.

Hey to both of you. REGINA BARBER, BYLINE: Hey. EMILY KWONG, BYLINE: Hi, Ailsa. CHANG: OK, so you guys have brought us three science stories that caught your attention this week. Tell us what they ...