Dogfish shark (IMAGE) University of Washington Caption Researchers developed a flexible pipe with an interior helical structure that enhances fluid flow in one direction, for use in applications ranging from engineering to medicine. The design mimics the shape of the intestine of a shark, like this spiny dogfish shark. Credit NOAA National Ocean Service Usage Restrictions Must include credit License Original 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.