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When scientists revved up the production of an enzyme called GPLD1 in older mice, it stimulated nerve growth in their brains and the animals navigated a maze better.

Scientists have discovered an enzyme that is elevated in people and mice who exercise a lot. They hope the discovery could lead to medicine that would have some of the benefits of exercise.

The conference championships in hockey and basketball are coming up, and this year, both of the defending champions are the teams to beat! NPR's Scott Simon speaks to Howard Bryant of ESPN.

Attorney General Jeff Sessions described the car attack as "domestic terrorism." That allows the government to open a broad investigation, but there's no such criminal charge as domestic terrorism.

Jeff Sessions said he would "be glad to yield" if President Trump no longer wanted as him attorney general. Sen. Lindsey Graham warned Trump that there will be "holy hell to pay" if Sessions is fired.

House Minority Leader Nancy Pelosi continues to express confidence she will be elected speaker of the House despite effort by small group of Democrats who say enough members want change to defeat her.

2016 started with a strong possibility the United States would elect its first female president, but by the end of the year an outsider with no political…

Howard Bryant of ESPN.com talks with NPR's Lynn Neary about the NBA playoffs and drug use by baseball players.

The end of a Depression-era alcohol has brewers happy to see the stuff go. "It was just a pain in the posterior, you know, for everyone," says one brewer.

The South Carolina Supreme Court has ruled to finalize the adoption of Baby Veronica by her white adoptive parents. The order comes after the U.S. Supreme Court ruled in June that her biological father, a Cherokee Indian, could not use the Indian Child Welfare Act to claim custody rights.

The Baylor University Bears illustrate the argument that defense is more important than offense in college football. Host Rachel Martin talks with NPR's Mike Pesca about the Bears and other sports news of the week.

Rep. Tom Cole, R-Okla., had sent a letter to President Obama urging him to seek congressional approval before any military action against Syria. Surprisingly, on Saturday, Obama agreed. Cole talks about what comes next.