Image 4 (IMAGE) University College London Caption Segment of ceramic water pipe excavated from Pingliangtai, now at Henan Provincial Institute of Cultural Relics and Archaeology in Huaiyang. Credit Yanpeng Cao Usage Restrictions For educational and editorial purposes only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.