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KELLY MCEVERS, HOST:

The gap between rich and poor is one of the great concerns of modern times. It's even driving archaeologists to look more closely at wealth disparities in ancient societies.

"That's what's so fun about it," says Timothy Kohler, at Washington State University. "It widens our perspective, and allows us to see that the way things are organized now is not the only way for things to be organized."

Updated at 4:20 p.m. ET

The U.S. military's restrictions on covering abortions can create logistical, emotional, career and health challenges for service members who become pregnant, according to a newly released study.

Two years ago, when the Zika virus was first identified as the cause of microcephaly in babies, women were scared. Expectant mothers who got infected had no idea what the chances were of having a healthy baby.

Researchers have since learned that while Zika infection is dangerous, about 94 percent of babies born to women infected with Zika appear to be normal at birth.

'Leaf Wonder' In A World Of Changing Forests

Nov 15, 2017

In Autumn, the receptors in our primate eyes revel in the red and gold of trees.

Our ability to perceive red color is an oddity, one shared by our cousins the Old World monkeys and apes, but not by most other mammals. Evolution endowed our ancestors with an extra type of light-sensing cone cell that helped them see fruit and edible young foliage against a background of mature dark green leaves.

Jeff Stevens decided to give up alcohol when he was 24.

He's 50 now — and he's had no regrets about going sober for the sake of his health. Except for one thing: He has really missed good beer.

"If you're drinking, you have an infinite amount of things you can drink," Stevens says. Shelves are full of craft IPAs, stouts and bitters. "Whereas only about half the bars I've been to have a non-alcoholic beer. And if they do, it's usually just one choice."

Think "renewable energy" and the wind and sun come to mind, but someday it may be possible to add ocean energy to that list.

At MedStar Washington Hospital Center, doctors and nurses are moving as many patients as they can from intravenous medications to the same drugs in pill form.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

STEVE INSKEEP, HOST:

Updated 5:56 p.m. ET

Senate Republicans now plan to try to repeal the Affordable Care Act's individual mandate as part of a tax overhaul bill.

Several Senate Republicans said Tuesday that including the repeal in tax legislation, currently making its way through a key Senate committee, would allow them to further reduce tax rates for individuals without adding more to the deficit.

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