The definition, based on a study of more than 1,300 problematic computer users, classifies as addicts those who spend at least six hours online a day and have shown at least one symptom in the past three months.

Symptoms of addiction included yearning to get back online, mental or physical distress, irritation and difficulty concentrating or sleeping.

According to the China Youth Association for Network Development, Internet-addicted youths are more likely suffer frustration in interpersonal relations than their peers.

About 10 percent of young users suffer Internet addiction, an earlier survey revealed, and about 70 percent are male.

Moon Map

China published the country's first full map of the moon surface on November 12, about a year after its first lunar probe--Chang'e-1--was launched.

Officials said the map covered a full range of areas on the moon surface, and it was the most complete image of the moon surface published so far.

New Opera

A national opera overseas popularization project was launched on October 24 at Renmin University of China in Beijing. As part of the project, a performance called Classic Moments in the Peking Opera Tradition opened to the public that night, merging Peking Opera with symphony.

The symphony enriched the musical accompaniment of Peking Opera and further explained the stories as they unfolded, helping to integrate drama, music and dancing on the stage.

Initiated by the university and co-sponsored by China International Publishing Group, the project includes translated versions of 100 performances, an overseas tour and a compilation of Peking Opera history.