What are polychlorinated biphenyls (PCBs)? HD

This video is now hosted on the Virginia Department of Environmental Quality channel ( https://youtu.be/qZNlBm_gRdU ). So I will remove this video by the end of 2018 This is a whiteboard animation video describing what polychlorinated biphenyls are, how they are used, why they are toxic to humans, and what we can do to avoid them. If you use this in a classroom setting, please let me know in the comments! This video was developed during the 2017 Virginia Sea Grant Advanced Science Communication Seminar.