The new evolutionary study found two main reasons for the primate anomaly: to attract mates and to threaten rivals.

Why do humans have larger penises than other primates? New research tests attraction, rivalry, and sexual selection for ...

Men assess potential rivals that have a larger penis as more of a threat, both physically and sexually, according to a study by Upama Aich at the University of Western Australia and colleagues, ...

You don't have to be a genius: anemones have been using human genes to form their bodies for 600 million years.

The human body is a machine whose many parts – from the microscopic details of our cells to our limbs, eyes, liver and brain ...

New research finds the human brain has a built-in pain map that activates in different areas when relieving face, arm or leg pain. But placebo pain relief only works where the brain expects it.