Bumsoo Han (IMAGE) Purdue University Caption Bumsoo Han, professor of mechanical engineering, has built a realistic model of a pancreatic structure that acts as a “time machine” to understand cancer and reverse its spread. Credit Purdue University photo/John Underwood Usage Restrictions No restrictions. License Public Domain 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.