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GOP presidential hopefuls converged in Iowa for the Lincoln Day Dinner. More candidates are entering the presidential race, in part, because there is no obvious next-in-line for the GOP nomination.

What if microbes could ferment sugar into narcotics, like the way yeasts make beer? That day is quickly approaching. This week scientists report all the steps needed to make morphine in yeast.

Women with dense breasts are more likely to get cancer and less likely to catch it early on a mammogram. But degree of density matters too, a study finds, as do other factors like family history.

Newly declassified materials include books, magazines and letters found during the 2011 raid on the al-Qaida leader's compound in Abbottabad, Pakistan.

Venus and Serena Williams have inspired thousands of young African-Americans to learn and play tennis, and brought racial diversity to the sport. Has golf benefited in the same way from Tiger Woods?

Trump gave a speech with few policy specifics, but that's not the point at all. He's channeling how a swath of people feel, and nothing sums it up better than 178 words he uttered.

Wisconsin Gov. Scott Walker's fight against unions thrust him into the spotlight four years ago. But when he used that issue to revive his struggling presidential campaign, the move failed badly.

It's tough to see Jason deCaires Taylor's sculptures firsthand — unless you have scuba gear. Most of them rest under the sea. His latest work is fully visible only when the tide of the Thames recedes.

Last month was the deadliest on record in the Central America country since the end of the civil war in 1992. There are more than 30 murders a day, due to gang violence.

Hillary Clinton's been a declared candidate for two months, but she's staging a launch Saturday in New York. NPR's Scott Simon talks presidential politics with NPR's Mara Liasson.