Haifang Wen, Washington State University (IMAGE) Washington State University Caption Haifang Wen in his Washington State University laboratory holding a small can of cooking-oil-based bioasphalt and a sample of the final hot mix asphalt. Credit Washington State University 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.