Dolphins Got Giant Testicles. We Got a Chin. Only One Makes Sense.

Dolphins Got Giant Testicles. We Got a Chin. Only One Makes Sense.

The human body is a machine whose many parts – from the microscopic details of our cells to our limbs, eyes, liver and brain – have been assembled in fits and starts over the four billion years of our history.

The unique human body part that evolution cannot explain

The human chin has long been fertile ground for arguments between scientists over its purpose

Why evolution can explain human testicle size but not our unique chins

neurobit/ShutterstockThe human body is a machine whose many parts – from the microscopic details of our cells to our limbs, eyes, liver and brain – have been assembled in fits and starts over the four billion years of our history. But scientists are still puzzling over why we evolved into this particular form. Why do humans uniquely have a chin, for example? And why, relative to body weight, is a human testicle triple the size of a gorilla’s but…