Ultrasound: Microrobot Tumbling in Colon (IMAGE) Purdue University Caption Live ultrasound footage shows a microrobot tumbling through a colon in vivo. Credit Purdue University video/Elizabeth Niedert and Chenghao Bi 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.