The author of this book was quoted by curriculum theorist William Pinar, saying that literacy actually changes [increases] the blood flow to the brain. I found that so interesting I checked out Pinar's glossary to learn more about Kotulak. I read chapters on line and found it so facinating, that I checked the book out of the library. I am truly facinated by all the evidence about brain chemicals like serotonin's link to agression, noradrenaline the hormone that alerts the brain to act in emergencies, survival, pecking order, genetic mutations in the brains ability to process and regulate serotonin and links to suicide; alcohol's affect on serotonin, lowering levels in the body which triggers agressive behavior. It explains a lot about violent human behavior, suicide, depression and how it's all tied together. A quick read for those interested in psychology and explanations of human behavior.