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A new study sheds light on a longstanding ecological question: How do so many species like impalas and elephants co-exist when they're all feeding on the same limited foods?

Two academics suggest that loans financed by the private sector could be one way to help patients cover the cost of expensive, curative pharmaceuticals. Think mortgages.

Clinton has always been a disruptive presence, who went places and did things that haven't been done before — at least not by women. Tuesday brought a devastating loss after a storied career.

Both the city and county of San Diego have more registered Democrats than Republicans, but you wouldn't know it from the upcoming race for San Diego mayor.

Richard Feynman, one of the greatest science teachers ever, asks a wave to tell him a story.

A cross-border partnership of environmental groups has released the results of a 10-year study on conservation. It says the United States and Mexico need to collaborate more on conservation efforts.

Only the 52nd District is seen as competitive

From self-driving cars to automated warehouses, humans are being pushed out of the equation. Soon, robots will "do a million other things we can't even conceive of," author John Markoff says.

When a woman addicted to opioids gives birth, she is too often dismissed as an obstacle to her infant's health. A Connecticut hospital is challenging that attitude — and the culture of care.

The World Resources Institute says you don't have to bid burgers bye-bye in order to reduce the environmental footprint of what you eat. Americans cutting back on beef could go a long way, it says.