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David Greene talks to billionaire financier and liberal activist Tom Steyer about his position on the Keystone XL oil pipeline.

A doctor filed a complaint against a Washington, D.C., hospital, saying that by telling her not to say that she does abortions, the hospital is stigmatizing the procedure. The hospital cites safety.

Lead, the "useful metal," was the pride of the Romans. For the last 5,000 years, it was used in products ranging from water pipes and makeup to wine — until we discovered how poisonous it is.

Potential answers for the unexpectedly high levels of silica all involve water. The space agency also says it found "a mineral named tridymite, rare on Earth and never seen before on Mars."

Returning to school after a few weeks away is a tough transition for many kids, but it's even harder for children living in stressful homes.

A Michigan artist is creating improvised sculptures out of merchandise inside big box stores. He wants to jolt people out of their everyday surroundings. But store workers have to clean up after him.

Do big-city chiefs like John Deasy, recently ousted from LA Unified, get enough time to make a difference?

NPR's Arun Rath speaks with Dr. Suzanne Donovan, an infectious disease specialist at Olive View-UCLA Medical Center, about the risk of infection for health care workers treating Ebola patients.

Investigators from the U.S. Department of Agriculture say they cannot figure out how genetically modified wheat got into an Oregon field. Now GM wheat has been found growing in Montana, too.

With the death of a northern white rhino in San Diego's zoo this week, researchers are working to see whether they can save the species. They'd better hurry — only five remain.