Researchers at the University of Maine are theorizing that human beings may be in the midst of a major evolutionary shift—driven not by genes, but by culture. "Human evolution seems to be changing ...

A new study posits that same-sex sexual behavior developed to help primates in complex social groups ease tension, reduce ...

The act of kissing may have started long before modern humans existed, a new modeling study suggests. Kissing stretches back roughly 21 million years, to the shared ancestor of humans and other large ...

Biologists tend to look at the animal kingdom and try to categorize things in an organized fashion. But nature has a way of ...

Human behavior is a tapestry woven from culture, environment, and biology. Among the most intriguing aspects of this tapestry is risk-taking—those bold, sometimes reckless decisions that can lead to ...

As early humans spread from lush African forests into grasslands, their need for ready sources of energy led them to develop a taste for grassy plants, especially grains and the starchy plant tissue ...

This has been quite the wild year in human evolution stories. Our relatives, living and extinct, got a lot of attention—from new developments in ape cognition to an expanded perspective of a ...

Long before evolution equipped them with the right teeth, early humans began eating tough grasses and starchy underground plants—foods rich in energy but hard to chew. A new study reveals that this ...