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Sleepwalking is common among children, and for many, it persists into adulthood. Though it's still not well understood, scientists have identified several factors that can trigger episodes of sleepwalking.

The U.S. Open gets underway in Flushing Meadows, New York, Monday. For a preview, Steve Inskeep talks to Jon Wertheim of Sports Illustrated. Roger Federer is the favorite on the men's side while Serena Williams is the overwhelming favorite for the women.

Just how do trees die? It seems like a simple question, but the answer still eludes scientists. And understanding forest ecology is increasingly important as the effects of climate change begin to take root.

Climate change is exaggerating the normal swings in weather. For the American Southwest, that means more intense waves of heat, drought and fire that could wipe out trees that have stood for centuries. It's already revamping the ecology of the landscape.

The giant insurance company Aetna plans to get a little bigger. It's buying Coventry Health Care for more than $5.5 billion. Medicaid is expanding under President Obama's health care law, and Medicare is expanding as Americans grow older — presenting many opportunities for private insurers.

Exports of goods and services have been one of the bright spots in the lackluster U.S. economy lately, growing much faster than almost anything else. But other economies are slowing. David Greene talks to David Wessel, economics editor of The Wall Street Journal, for a check on the global economy.

The wife of disgraced Chinese leader Bo Xilai has gotten a suspended death sentence for killing a British businessman. Gu Kailai was convicted after confessing to killing Neil Heywood. Her accomplice, a family employee, was sentenced to nine years in prison.

Stylish, exuberant and kinetic are words often associated with the late Tony Scott's movies. The director found success with energetic films that sometimes didn't gain a following until well after their commercial release.

From murder in the Venice canals to human trafficking in the desert, Los Angeles serves as the perfect setting for Robert Crais' noir novels, starring Elvis Cole and Joe Pike, two PIs who are desperately seeking normal — both for their clients and themselves.

Ever wonder how charitable the people are who live in your area? It turns out that lower-income people tend to donate a much bigger share of their discretionary incomes than wealthier people, according to a new study. And rich people are more generous when they live among those who aren't so rich.