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Girls in the U.S. are getting their first menstrual period about 6 months earlier on average than they did in the 1950s and '60s. And the number of girls starting their period before age nine has doubled. Researchers say parents can help prepare their kids for early puberty.

The brief declaration of martial law in South Korea last month has drawn comparisons to the Jan. 6, 2021, attack on the U.S. Capitol. The attempted power grabs could hold lessons for other democracies.

Twenty-two states say the Trump administration is illegally freezing money from the Federal Emergency Management Agency. The administration says the funding is just being "reviewed" and isn't frozen.

Economists may have a pretty dismal record with predictions. But we're still interested in what they see in their non-existent crystal balls.

NPR's A Martínez asks veteran political analyst and pollster Frank Luntz how Kamala Harris' entry into the presidential race might affect the fight for control of Congress.

In an effort to meet a Kyoto Protocol pledge, Japan managed to cut about 1.4 million tons of CO2 emissions last year. The nation reduced summer air-conditioning use, overturning a decades-old "suit and tie" tradition along the way.

Nearly a third of Americans were under extreme heat advisories, watches and warnings. In Nevada, Arizona and California, desert temperatures could soar, in parts, past 120 F.

New data offers further confirmation of a crisis in the U.S. student loan portfolio, in which too many borrowers are not repaying their student loans.

The merger, announced Friday, would bring two of the industry's biggest players in film and TV under one roof. Beyond its television and motion picture division, Warner owns HBO Max and DC Studios.

Long welcoming of refugees and asylum-seekers, Sweden is now seeing growing resentment. An anti-immigration party is gaining strength, mosques have been firebombed and anti-Semitism seems on the rise.