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Chinese social network site YY originally allowed customers to watch other people play video games, but users realized that the site had more potential. It could be a place to perform virtual karaoke.

Even in an age of galloping ambition, the Texan rides ahead of the pack. Obama liked to quote Martin Luther King's line about "the fierce urgency of now," Cruz seeks to embody it at every turn.

Subsidies created by the health law to help workers buy their own coverage and steady increases in companies' insurance costs have made it easier for them to decide to discontinue health insurance.

Uber's "surge pricing" quadrupled fares for some customers trying to flee the area in Sydney where a gunman took hostages. France banned Uber's low-cost service over its lack of professional licenses.

In the face of abuse concerns, Medicare covered more prescriptions for potent controlled substances in 2012 than in 2011. Top prescribers often have faced disciplinary action or criminal charges.

Dr. Thomas Frieden visits West Africa this week to assess the fight against Ebola. His goal? Figure out how to keep the disease from turning into a permanent problem.

The region claimed is more than the size of Texas and Oklahoma combined. The energy-rich Arctic is also contested by Canada, Russia, Norway and the U.S. A U.N. panel will study the Danish claim.

The court has upheld a cocaine conviction that began when police stopped a car with just one brake light, even though state law in North Carolina requires only one brake lamp.

Audie Cornish talks to Australian terrorism expert David Kilcullen about the relationship between the Australian government and Muslim communities.

"We run the risk of going from hysteria to a sense of indifference," says the now-recovered physician. "And I think that is even more dangerous than our fear."