Humans lost their ability to synthesize their own vitamin C because our ancestors had access to plenty of fruit.

If the world feels out of control, dystopian, or even apocalyptic, it's possible to change course. The fate of the human species may be at stake!

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 4 billion years of our ...

Our ancient ancestors didn’t have clothes or houses – but that constant exposure to the sun helped their skin protect itself from the worst sun damage.