Flow Field (IMAGE) University of York Caption Sperm stirs the fluid around in a very coordinated way locomotion, not too dissimilar to the way in which magnetic fields are formed around magnets. Credit Kyoto University 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.