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The U.S.-funded aerial spraying program has been aimed at killing the plants that feed the cocaine industry. Colombia says one of the chemicals in the spray may cause illnesses.

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.

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.

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.

On Tuesday, Senate Democrats kept trade legislation from moving forward, dealing a blow to President Obama's agenda. Republicans and the White House now grapple with what comes next.

The police department in Oakland, Calif., teaches residents who are enrolled in the citizens police academy the nuts and bolts of policing. The academy is now so popular that there's a waiting list.

The Centers for Disease Control and Prevention is involved on nearly every front, from diagnostics to the study of a possible link to microcephaly and Guillain-Barre syndrome.

Americans of all ages are tossing away the keys and giving up their driver's licenses, a new study shows. Cars are being replaced by bikes, public transit and ride-hailing services.

The Big Bend area of West Texas is known for its enormous, sparsely populated counties. This can be a problem for county services — whether you're an ordinary citizen or a Supreme Court justice.

For Iranian tourists at this ancient Persian capital, awe for the past is tempered by disappointment about the present. "We have nothing new that makes us special in the world," says one visitor.