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The streaks on the Red Planet's surface appear to be caused by salty water, but how much water there is — and where it comes from — remains a mystery.

End poverty and hunger. Educate all kids. Fight climate change. Can the U.N. do all that while coping with the biggest refugee flow since WWII?

The investigation will focus on whether fraud was committed through the sale of diesel-powered vehicles equipped with technology that cheats emissions tests.

Kenyan runner Eliud Kipchoge shrugged off the shoe failure that potentially cost him the world record, saying his pair of Nike running shoes are "actually very good."

A large study confirms that a test doctors have been using for a decade works well for low-risk patients. More work is needed to draw conclusions about chemotherapy for women with riskier tumors.

Sen. Chuck Grassley has sent a letter to government investigators that also asks for a list of documents and information the charity failed to provide.

The consumer advocate and former presidential candidate's new museum in Connecticut is filled with items like defective toys and unsafe machines.

Pediatricians need to do more to get the right health care for children in foster care, according to the American Academy of Pediatrics. Those children often miss out on both routine and acute care.

At an aviation conference, analysts predicted lower prices are coming for air travel — and for drones — this holiday season. Cheap fares will be welcome news. Cheap drones may be a different story.

Mahmoud Abbas is set to address the United Nations on Wednesday, capping the day by raising the Palestinian flag alongside those of member states. But back home, his leadership is in doubt.