WEI Ming Rui chuckles at the notion that thekarst hills in his backyard are considered world wonders. To him, the conical rock formations common to southern China are simply the accustomed backdrop to his whole life. As for world wonders, Wei has no clue. The 45-year-old head of Nongxiang Village in Du'an County, Guangxi Zhuang Autonomous Region is also its most-traveled person, but he has never been more than 30 miles from the house in which he was born and lives to this day.