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Sweat is an "evolutionary marvel," says Sarah Everts, the author of The Joy of Sweat. In her new book, Everts delves into the science of perspiration and how this trait has enabled humans to thrive.

An analytical look at the week's news events. Topics include the readiness of Iraqi security forces; a new Supreme Court session with a new chief justice; Tom DeLay's indictment and reporter Judith Miller's grand jury testimony.

Even as some lawmakers say it's "nuts" not to take action, any measure faces exceedingly slim odds of passing in the 50-50 Senate.

NPR's Leila Fadel talks to author Rusha Latif, who embedded herself with Egyptian revolutionaries, and writes about what the world can learn from a defeated revolt in Tahrir's Youth.

Scientists say comedian Lewis Black has a lot in common with fruit flies. They're both really good at acting angry, probably because human anger has roots in animal aggression.

The National Eating Disorders Association took down a controversial chatbot, after users showed how the newest version could dispense potentially harmful advice about dieting and calorie counting.

Ron Currie's new novel, "The Savage, Noble Death of Babs Dionne," tells the story of a small-town drug mobster, a formidable woman of French descent. NPR's Scott Simon talks to Currie about it.

The war in Ukraine enters its fifth year this week, with millions of Ukrainians displaced, hundreds of thousands of soldiers killed, and little change on the battlefield.

Barbuda, Anguilla, St. Martin and the British and U.S. Virgin Islands bore the brunt of the Category 5 monster that could hit Florida within days.

The president's raucous Arizona rally fits a familiar pattern for Trump and should finally put an end to the persistent question of whether he will "pivot" and be more presidential.