A toxic environmental chemical, a polycyclic aromatic hydrocarbon, or PAH, a group of chemicals that scientists believe represent a “re-emerging” environmental concern.  When I read the article, it reminded me of the alarming canary in the coal mine scenario as exposure to carcinogens during early pregnancy development can set the stage for cancer years later. The science of “epigenetics” reveals how genes can undergo permanent changes, based on toxic insults, nutrition or other factors. Something to consider, we have the power to mutate into our own extinction.