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TV ads are a tried-and-true way for politicians to get their message out. But in this chaotic presidential primary, are they still effective?

Clay tablets show that Babylonian astronomers tracked planets using a method that was thought to be invented 1,400 years later. In a way, scientists say, the ancient techniques were "very modern."

Ted Cruz's campaign says it raised nearly $20 million during the last three months of 2015. And as the calendar shifts to 2016, Jeb Bush and Donald Trump are changing how they spend money.

Raghuram Rajan was a U.S. resident, educated in both India and the United States. That C.V. and questions on policies put Rajan in the line of fire.

The Oakland Police Department's interim police chief was forced to resign after just two days on the job. His departure marks the third interim chief in nine days.

Fighting has intensified near two major cities held by pro-Russian separatists in eastern Ukraine. In Berlin, a meeting on a cease-fire ended without any breakthrough.

The state produces a lot of energy, but environmentalists and the oil industry are joining to combat wind power companies as they try to expand.

An initiative launched with Maria Shriver's input is raising questions over how the hotel company pays its staff — and whether guests should be expected to tip.

Chronic stress can lead to heart disease, cancer and other health problems. A study shows it doesn't matter if the stress comes from major life events or minor hassles. Time to take a deep breath?

Dr. Kent Brantly and missionary Nancy Writebol have gone through "a rigorous course of treatment and thorough testing," Emory University Hospital's Dr. Bruce Ribner says.