I have been searching for environmental causes of autism for over a decade, and I now believe that I have identified the key toxic environmental factors that are causal in the epidemic. The most significant factor is glyphosate, the active ingredient in the herbicide Roundup. What makes glyphosate so dangerous is that it is pervasive, cumulatively insidiously toxic, and widely believed to be nearly harmless to humans. Glyphosate collaborates with toxic components in vaccines to destroy neurons. These include, primarily, aluminum, mercury and glutamate. While glyphosate contamination in the food sets up a leaky gut barrier and leaky brain barrier, glyphosate contamination in many vaccines is ominous and likely catastrophic. In this talk, I will present the hard-core scientific evidence for the complex metabolic cascade these toxic metals and chemicals induce, beginning with disruption of gut microbes, bile acids, and digestive enzymes, and ending with a devastating neurological disability. Stephanie Seneff, BS, MS, EE, PhD