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Zoo nutritionists these days have to do more than try to keep displayed animals happy and healthy. Sometimes the goal is to bring endangered wildlife back from the brink.

A carrot isn't enough — bring on the stick. A study finds smokers are more likely to quit tobacco if they lose some of their own money after a relapse, than if they get a bonus for quitting the habit.

White House press secretary Josh Earnest has called a delay in passing trade legislation a "snafu." But he said he didn't know how to translate the word for countries impacted by the deal. We do.

No one has been a late-night TV host longer than David Letterman, who retires Wednesday after 33 years. Here's what he told TV Critic Eric Deggans about leaving the Ed Sullivan Theater one last time.

Researchers in Seattle are busy cataloging what scientists have learned. For now that includes detailed information on 240 mouse cells. Next up: a data trove of details on human brain cells.

The 65-33 vote comes two days after senators rejected a measure to take up the bill giving President Obama fast-track trade authority.

The Affordable Care Act has made available more assistance to new mothers so they can raise healthier kids. But critics say the standards for those programs are too lenient.

John Sopko says the Afghans still do a poor job of managing the billions they get from the U.S. and he has documented the abuses. Still, he supports the ongoing U.S. efforts there.

The green health halo hovering over kale glows brightly, and the company is putting it in breakfast bowls in nine Southern California locations. Will it help brighten up the Golden Arches?

The building was damaged during the Ebola outbreak. How do you welcome kids back? That's the challenge that a team of street artists faced.