The persistence of PFAS chemicals and their implications to the environment and our health are hot topics. But, there is so much more to understand about these chemicals. What are PFAS exactly? How can we tell whether the measurements in each study are accurate and comparable to those in other studies? Great science is being done by NIST (National Institute of Standards and Technology) and Dr. Jessica Reiner, Research Chemist at NIST, to help us arrive at more reliable data. She and her team develop and maintain reference materials (RM) and standard reference materials (SRM) for use in calibration and interlaboratory comparison studies. Together, let's get into the nitty gritty of this topic.