The first thing that caught my eye in Chapter 14 was a paragraph on a pair of identical twins separated at birth. Both twins were named "Jim" by their adoptive parents, constructed similar looking tree-houses as children, named their dogs "Toy," and married twice, both to women named Betty and Linda. After reading this story, I was interested in learning more about twins. Chapter 14 focuses on personalities, and the first part of the chapter is centered on twins. In this section I found it remarkable that the correlation of many personality traits between both identical and fraternal twins remains the same regardless if they are raised together or apart.
Towards the end of the chapter, common pitfalls of personality tests are discussed. Many people claim to be able to determine an individual's personality with various tests. Graphology (handwriting interpretation), criminal profiling, and color tests are all said to be able to assess someone's personality, yet they are not very accurate in doing so. The FBI hires criminal profilers to catch criminals, but they can only do so much. One former FBI profiler was in charge of profiling the famed D.C. Sniper, and he only could predict that he was "self-centered" and "angry" at others. These are both fairly obvious guesses that "non-experts" could have made. As cool as these profilers can be made out to be in TV shows like Criminal Minds, criminal profiling is more of an art than a science.