IQ and intelligence, as a topic of study in themselves, no longer interest me very much because they are largely a foregone conclusion for me. Long ago I was convinced of the very realness and importance of IQ and of the fact that it is largely a genetically-mediated trait. What interests me these days is applying the knowledge gleaned from this field to other areas of inquiry that interest me.
I made an exception for the very short book Intelligence: All That Matters by the young researcher Stuart Ritchie, hoping that it would b an authoritative summary of the field that I can refer other people to in my work. And the book serves this function reasonably well.