Mr. Pendell book discusses the human evolution from its origins to the present. He focalise on the issue that humans evolution is improved by harsh conditions that where present during the Ice ages, since only the more intelligent elements would survive. As climate improved the less capable outbreed the more intelligent.

As examples of his these he bring forth archeological samples of the Cro-Magnon man whose brain was about 30% bigger than modern man. Also early Neanderthal man of the Neolithic during an ice age had a bigger brain than the Neanderthal man of the mild Mesolithic age.

He comes to present day United States Welfare policies and shows the skyrocketing devolution happening in just a few decades of liberal policies.

All together a must get.