The Tetraneutron (IMAGE) Iowa State University Caption James Vary, right, and coauthor Andrey Shirokov with an illustration of a tetraneutron. Credit Christopher Gannon/Iowa State 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.