Creating Knotted Chemical Structures (IMAGE) University of Chicago Caption Yossi Weizmann (standing), assistant professor in physics at the University of Chicago, and graduate student Di Liu are pictured here in the laboratory. Liu was the lead author of an article that appeared in Nature Chemistry describing how to create tiny, knotted chemical structures that may provide a way to rapidly screen hundreds of chemicals for anti-cancer activity. Credit Joel Wintermantle/University of Chicago Usage Restrictions News organizations may use this image in connection with reports about the research of Yossi Weizmann and Di Liu. 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.