This section covers many different topics and concepts about the biological aspect of psychology. I found it very interesting learning about the 100 billion plus neurons that are in the brain and there functionality. Neurons are specialized cells that communicate with one another. The chapter also goes in depth as to the specific pieces and characteristics of neurons in the brain. This chapter discusses neural plasticity or changes that occur in the brain over time, one such stage is known as pruning; where 70 percent of neurons die off. Two different systems are mentioned, the central nervous system (CNS) and peripheral nervous system (PNS). There functions are further explained in the text. The most intriguing portion of the chapter to me was the differences between the left brain and right brain and how split brain surgery has effects on people. The left brain is more intellectual while the right deals more creatively. People often lean slightly more to one side being more intellectual or more creative. This has caused me to wonder which one do I lean more towards?