“Snakes are the most widely dreamed about, most feared, most religiously significant creature in the world. A squiggle, they are believed to be the first animal ever drawn. As sea serpents they embodied terra incognita on ancient maps; they marked a “Don’t Tread on Me” barrier between the colonies and the rest of the world; they are the physical line between the Judeo-Christian notions of good and evil. No other creature figures so widely in folklore and myth. No other creature is so universally accused of hijacking the amygdala, the region of the brain responsible for flight. According to a recent hypothesis published in the Journal of Human Evolution, the shape of the human head—eyes front, large brain—stems from a desire by man’s ancestors to avoid snake predators.”