Cairo has cancelled naval exercises with Turkey scheduled to take place in October to protest Ankara's "clear interference" in Egypt's domestic affairs, the foreign ministry said on Friday.

The measures were in "protest at the unacceptable Turkish statements and actions which represent a clear interference in Egypt's domestic affairs and stand against the will of the Egyptian people," the ministry said in a statement.

Adult obesity in the U.S. still isn't budging, the latest government survey shows.

The national telephone survey found 13 states with very high rates of obesity last year. Overall, the proportion of U.S. adults deemed obese has been about the same for years now.

Facebook plans to test a mobile payments service that lets users make purchases inside mobile applications using payment information they have added to their account on the social network.

Facebook Inc. said Thursday that it is working on a "very small test" and the company says there is no set schedule for making the service available to users. The service would use payment information that shoppers store on Facebook to automatically complete checkout forms of certain mobile apps. Then, the app would process the purchase.

U.S. President Barack Obama said Thursday the United States has canceled military exercises with Egypt to protest the killing of hundreds of protesters, in his first public statement on the rapid developments in Egypt.

He interrupted his weeklong vacation to address the clashes that have left more than 500 people dead.

When people have a brain injury so severe that they can't squeeze a loved one's hand or otherwise respond, there are few good ways to tell if they have any lingering awareness or are in a vegetative state. Now researchers have created a tool to peek inside the brain and measure varying levels of consciousness.

The work reported Wednesday is highly experimental, not ready for bedside use yet — and if it pans out, a big question is how to use it without raising false hope. No one knows what level of consciousness at a certain point after injury really predicts recovery.

Long-term results from a major U.S. study ease worries about the safety of a hormone-blocking drug that can lower a man's chances of developing prostate cancer.

The drug cut prostate cancer risk by 30 percent without raising the risk of dying of an aggressive form of the disease as earlier results hinted it might.

There are three reasons why Barcelona is favored to defend its Spanish league title.

They are as concise as they are convincing: Lionel Messi, Andres Iniesta and new arrival Neymar.

Just weeks after winning the Wimbledon title, Marion Bartoli retired from tennis on Wednesday, tearfully conceding that the pain from a series of injuries was too much to bear.

"My body was really starting to fall apart and I was able to keep it together, go through the pain — with a lot of pain — throughout this Wimbledon and make it happen," the 28-year-old French player said, tears running down her cheeks. "That was probably the last little bit of something that was left inside me.

Serena Williams overcame what she described as one of her worst sets before beating qualifier Eugenie Bouchard of Canada 4-6, 6-2, 6-2 on Wednesday in her opening match at the Western & Southern Open.

"So it was just some crazy tennis out there," Williams said.

Gonzalo Higuain and Ever Banega scored as Argentina extended its unbeaten record against Italy to four matches with a 2-1 win over the Azzurri, while Brazil was handed a 1-0 loss by Switzerland in another friendly on Wednesday.

Brazil's 11-match unbeaten run came to an end as Dani Alves scored an own goal with a header into the top-left corner.