Marc Fogel, a Pennsylvania schoolteacher, has been release from Russian prison. NPR's Ailsa Chang talks with his sister, Anne Fogel, about how the family is feeling now.

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 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 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 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.

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 ...

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. KUOW is Seattle’s NPR news station.

NPR's Cory Turner has been following the story and joins us now. Hi, Cory. CORY TURNER, BYLINE: Hey, Ailsa. CHANG: OK, so I want to start with these workers who have been just put on leave.

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 ...