Are there any good books exploring the topic of what human intelligence is?
Yes, there are a few  good books exploring the topic of human intelligence. Here are a few recommendations:

1. "The Mismeasure of Man" by Stephen Jay Gould - This book examines the history of intelligence testing and argues that it is not an accurate measure of human intelligence.
2. "The Bell Curve: Intelligence and Class Structure in American Life" by Richard J. Herrnstein and Charles Murray - This controversial book argues that intelligence is largely determined by genetics and has significant implications for social policy.
3. "Intelligence: A Very Short Introduction" by Ian J. Deary - This book provides an overview of the current understanding of human intelligence, including how it is measured and its relationship to other cognitive abilities.
4. "The Intelligence Paradox: Why the Intelligent Choice Isn't Always the Smart One" by Satoshi Kanazawa - This book challenges conventional wisdom about intelligence and argues that highly intelligent people sometimes make poor decisions.
5. "The Hidden Brain: How Our Unconscious Minds Elect Presidents, Control Markets, Wage Wars, and Save Our Lives" by Shankar Vedantam - This book explores the ways in which unconscious biases and cognitive processes influence human behavior and decision-making.