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Scientists in the United States say they've developed an ultra-slippery toilet coating to stop human waste sticking to the surface of a loo. Researchers from Penn State University in the United States are behind the research and Tak Sing Wong is the man leading the project. He spoke to ³ÉÈË¿ìÊÖ Newsday. (Picture: Loo Toilet Lavatory. Credit: ³ÉÈË¿ìÊÖ)