New Results From the RHIC Spin Program (IMAGE) American Physical Society Caption Studies have revealed a puzzle about how the inner building blocks of a proton, known as quarks (colored spheres) and gluons (yellow “springs”), contribute to proton spin. Experiments at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory are helping to solve this mystery. Credit Credit: Courtesy Brookhaven National Laboratory Usage Restrictions Credit: Courtesy Brookhaven National Laboratory 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.