Undated file photo provided by Linhai Cai of the Archaeological Institute of Qinghai Province shows skeletons at a prehistoric settlement site called Lajia in northwest China's Qinghai Province, where three bone samples for radiocarbon dating were collected. Scientists have found what could be geological evidence of a legendary flood tied to the establishment of the first dynasty in China, Xia, and even the beginning of Chinese civilization, a study published in the U.S. journal Science said on Aug. 4. (Xinhua)
