"Time machine" on a microscope slide (IMAGE) Purdue University Caption Within the glass platform of this microscope slide, researchers recreated two anatomical structures involved in the spread of pancreatic cancer. 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.