Wal-Mart, the nation's biggest company, affects the lives of millions of workers and shoppers. So its U.S. leadership change is attracting lots of interest. Here are some theories about what happened.

The State Department says it has evidence that Moscow is lobbing artillery across its border at Ukrainian government forces, and that the Kremlin plans to ship rocket artillery to the rebels.

Un-air-conditioned jails and prisons are often uncomfortable for both prisoners and for guards. But for inmates whose health conditions make them sensitive to the heat, they pose serious health risks.

A casting call asked for attractive light-skinned women of any race but black women who looked "poor" and "not in good shape." A panel of industry insiders weighs in.

The 20th annual International AIDS Conference is currently being held in Australia. Host Michel Martin speaks with AIDS researcher Dr. Anthony Fauci about the news coming out of the conference.

The European Court of Human Rights said Poland broke the European human rights convention by allowing the CIA to imprison and torture two terrorism suspects in secret prisons on its soil.

The problem in the U.S. State Department system could cause problems for millions of people worldwide who are awaiting travel documents.

Sen. John Walsh lifted at least a quarter of his United States Army War College master's thesis, according to a report in The New York Times. Walsh was appointed to the Senate in February.

Swimming pool drowning rates among school-aged black children are more than five times higher than they are among white kids the same age.

Most people can't tell when they're having the irregular heartbeat called atrial fibrillation that puts them at risk of stroke. Simply learning to take your own pulse could help, researchers say.

An open revolt among moderate Kansas Republicans has clouded Gov. Sam Brownback's re-election hopes and focused national attention on the tax-cutting experiment at the heart of his "red-state model."

In 1701, Antoine de la Mothe Cadillac founded the beginnings of modern-day Detroit — area code 313. Motor City can't throw a big celebration because of its bankruptcy, but there will be some parties.

The murder trial is underway for Theodore Wafer, the Detroit homeowner who shot Renisha McBride, an unarmed black teen, on his porch. Wafer claims self-defense; prosecutors say there was no threat.