The brain is the most complex organ in the human body and is central to our nervous system. Our brain stems are in charge of all of the different functions that our bodies need to stay alive; digesting food, circulating blood and breathing air are just some of the tasks that it is responsible for. In the How it Works Book of the Brain, we will delve into the deepest parts of the human mind by looking at how our brain develops throughout our lives, the affects that drugs and other substances have on it and what altered states of consciousness are. For every question that you have, this book will likely provoke ten more and answer them accordingly. Prepare to have your mind (or brain) blown.