Intelligence - one word that encapsulates many key meanings for humanity. The development of the human brain over the years has allowed more and more research to be done by scientists. The author of the book asks the question "Intelligence or intelligences?" and explains to the reader whether we can speak of intelligence in the plural or singular. What is the "g-factor ?", a thoroughly discussed topic, allows the reader to understand the importance of innate intelligence - the "g" factor. Some skills cannot be learned, we simply have them in our genes.