In episode 170, David speaks with Chris Exley about his recently published research that found extremely high levels of Aluminum in some areas of brains taken from deceased people diagnosed with autism. This research is not easy, as the number of brains and amounts of material available for analysis, are very limited. He explains why some of the criticisms are based on a lack of awareness of the restrictions placed on researchers, and some are based on the demands of peer-reviewers that must be satisfied for publication to be approved. The increasing use of Aluminum in vaccine adjuvants is the most likely source of the Aluminum in the brain. Since Aluminum is electrically active, and has no biological role in the brain, its presence is very dangerous.