Science and technology

Associated Press
Prof. Wu Xiaohong, Director of China's National Lab of Quaternary Chronology, poses for photos in a radiocarbon lab of Peking University in Beijing Thursday, June 28, 2012. Wu and her archaeologist team members have determined pottery fragments found in a south China cave to be 20,000 years old, making them the oldest known pottery in the world. (AP Photo/Alexander F. Yuan)

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