The Fox river is one of a few rivers that run north in the US. (The longest North-flowing river in the world is the Nile.) The Fox is also the second-most polluted river in the United States, the other being the East River in New York. Most of the pollution comes from the booming paper industry in the area-the Fox Valley is the US's largest producer of paper. PCBs are the most toxic chemicals in the Fox, along with other biphenyls and chlorinated wastes. In case you are wondering what we poisoned our beautiful rivers with and why, PCBs were used to make carbonless copy paper in the 60s and early 70s. Now, we can't eat the fish.
Gee, I sure am glad we got that carbonless copy paper. Where would the world be without it...