Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Intelligence is defined as the ability to acquire and apply knowledge. Attempts to define the primary influence on intelligence have sparked an ongoing “nature versus nurture” debate, dividing scholars in two opposing groups. One group of academics believes that intelligence is mainly hereditary, while other theorists argue that environmental and social factors are more influential forces on the individual's intelligence. Learn more about intelligence and theories proposed to study this ability of the human mind in this book.