Zhifeng Ren (IMAGE) University of Houston Caption Zhifeng Ren, director of the Texas Center for Superconductivity at UH and corresponding author for a paper describing the work, said allowed for recovery in lab tests of 80% of extra-heavy oil with a viscosity of more than 400,000 centipoise at room temperature. Credit University of Houston Usage Restrictions None 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.