 The Ape-Man Within

The Ape-Man Within is a 1995 science book by L. Sprague de Camp, published in hardcover by Prometheus Books.The book undertakes to demonstrate how humankind's self-inflicted problems are rooted in its evolutionary past, with primitive survival traits appropriate to ancestral primates who were organized in small, foraging bands still manifesting in modern societies as competitive, adversarial behavior.