The desire for intimacy has biological roots and, in the great majority of people, persists from birth until death.

But should our biological roots matter this much?

Some scientists believe both evolutionary psychology and neuropsychology suggest that human violence does indeed have biological roots.

By driving story right down to its biological root, to cell and stimulus, he nearly annihilates metaphor.

The other half was spent exploring the psychological, environmental and, in some cases, biological roots of aggressive behavior.

The tree of knowledge: The biological roots of human understanding.

As a consequence, it is a more all-encompassing interdisciplinary concept, but maintains deep biological roots.

The finding gives insight into the biological roots of our urge to assist others in need.

Research in the areas of evolutionary psychology and neuropsychology suggest that human violence has biological roots.

Research has revealed tantalizing clues to the biological and genetic roots of the disease.