(Paperback)

"Drawing on five decades of statistics and research, [this book] demonstrates that a new upper class and a new lower class have diverged so far in core behaviors and values that they barely recognize their underlying American kinship--divergence that has nothing to do with income inequality and that has grown during good economic times and bad"--Amazon.com.

(Hardback)

(Hardback)

All people are equal but, as Human Diversity explores, all groups of people are not the same -- a fascinating investigation of the genetics and neuroscience of human differences.