The chin is one of our most familiar features, yet scientists still debate why we evolved it. Here’s a breakdown of what we ...

Fear has a scent. Here’s how this invisible chemical signal has shaped human perceptions, emotions and survival instincts.

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 ...