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 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.