Fibers and Sperm (image) University of Washington Caption The electrospun fibers can release chemicals or, as shown here, they can physically block sperm. Credit Kim Woodrow, Univ. of Washington Usage Restrictions With credit 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.