A normal or average I.Q. is 100, an I.Q. of 130+ is considered to be in the “gifted” range, and an I.Q. of 145+ is considered to be in the “very gifted” (or “genius”) range. In the 1980s, researchers began to recognize that there was more to giftedness than just the linguistic and logical-mathematical intelligences measured by I.Q. tests. Other intelligence included: musical, visuo-spatial, bodily-kinesthetic, inter-personal, and intra-personal. While an individual may qualify as a genius in one of these other intelligences without an I.Q. of 145+, statistical precision is lacking.
Most geniuses are introverted intuitives with a high level of creativity and a high level of mental illness, particularly mood disorders. In this book a number of geniuses are profiled: 8 with mental disorders, 11 from the historical past, and 12 contemporary.