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PFAS are a family of chemicals accumulating in the soil, rivers, drinking water and the human body. How much exposure to these substances in clothes, firefighting foam and food wrap is too much?

NPR's Ailsa Chang talks with Stan Meiburg, the former acting deputy administrator for the Environmental Protection Agency, about the train derailment that led to a toxic spill in East Palestine, Ohio.

The latest NPR/PBS NewsHour/Marist survey finds the economy is still top of mind for Americans — and that both parties are vulnerable on different issues.

The world's highest concentration of data centers is in Virginia. Many residents are not happy about that.

Misinformation spread quickly after the wildfires in Los Angeles last year. Some of these false narratives on social media had an impact on California policy.

One of President Biden's most popular infrastructure proposals hearkens back to FDR's New Deal. A Civilian Climate Corps would aim to tackle climate change while caring for public lands.

SIMPLE.Robert talks with Tom Oschenslager,(OSH-EN-SLANHG-ER), is a tax partner the accounting firm Grant Thornton in Washington DC. He spoke to us from his office. 3. LIGHT & LAG. Noah talks with Dr. Charles Czeisler (SIZE-ler), Associate Professor of Medicine at Harvard Medical School, and senior author of a new study on human response to light. The study, published today in the journal Nature, shows that normal levels of indoor light, not just bright light, can reset the human biological clock. Czeisler says that, thanks to Edison, our bodies are in a permanent state of jet lag.

School began in most districts across the country today. Many high schools start at 7:30 AM....but in Minneapolis, high schools have, for the fourth year, begun their day later...at 8:40AM. The dramatic change is the result of years of sleep research on adolescents...which finds they naturally fall asleep later, around 11:30PM. And what's more...they need about nine and a half hours of sleep each night. So without the later start times..teens are perpetually in what researchers call "sleep debt." NPR's Michelle Trudeau reports.

NPR's David Welna reports on the 20th anniversary of the Mariel Boatlift, the massive wave of immigration from Cuba to Florida in 1980. Over a five-month period, 125-thousand Cuban refugees left Cuba from the port of Mariel, and traveled to the United States in small boats. Processing the huge influx overwhelmed the Immigration and Naturalization Service. The INS task was even harder because the refugees included convicted criminals who had been released from prison and mental patients freed from institutions.

Robert speaks with Willi Korte (KOR-tay), a lawyer and World War II historian, about the announcement that Switzerland's three largest banks are setting up a fund in memory of Holocaust victims. Korte discusses the nature of Switzerland's neutrality during the war - Switzerland sheltered some Jewish refugees, but turned away others. It also accommodated offices for both the OSS and German intelligence agencies. Korte says the big question is how much of the billions of dollars worth of gold and art that flowed through Switzerland during the war is still there.