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The U.S. and China are the world's two largest polluters, but the will to do something about climate change is lower in both than in the rest of the world. In the U.S., there's a party split.

The Oct. 3 strike on a Doctors Without Borders facility in Afghanistan — which killed 30 people — was found to be the result of human error, compounded by faulty equipment and communication failures.

Americans' junk food calories increasingly come from big box and convenience stores rather than traditional grocers, a study finds. And researchers say this trend is a public health concern.

The test aimed to help high-risk Medicare patients navigate the health care maze. But after three years, expected improvements in quality and savings failed to materialize.

The youngest two generations of voters finally outstripped the number of older voters in 2016 — a sign of how politicians will have to grapple with winning over a fast-changing electorate.

Surveys of 50,000 people found that those who smoked marijuana had sex more often than those who abstained from the drug. What is unclear is whether other factors explain the apparent link.

Some Senate Republicans have suggested they will work with Democrats to craft legislation on health care after their party failed repeatedly to pass a bill on their own. But that is also an uncertain path.

A watchdog group says Facebook only labeled about half of posts promoting articles from the world's main publishers of climate denial. Facebook says it was still rolling out its system at the time.

The Dow Jones industrial average slumped 2.8% after briefly skidding more than 1,000 points. The S&P 500 had its biggest one-day loss in almost seven weeks.

The wealth of the submersible Titan's passengers contrasted with the desperation that pushed hundreds of migrants to leave their homes and try to reach Italy by boat last week.