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.

Congress holds the power of the purse. But President Trump and Elon Musk are swiftly using executive actions to dismantle federal programs funded and approved by Congress.

Venezuelan migrants sent to Guantanamo Bay are being held in a military prison that has housed al-Qaeda members.

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.

Lt. Col. Harry T. Stewart, Jr., who was a member of the famed Tuskegee Airmen, died this week at the age of 100. The Tuskegee Airmen were an all-Black unit of pilots that fought during World War II.

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.