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 ...

Add Yahoo as a preferred source to see more of our stories on Google. A new study shows that evolution may look neutral only because shifting environments prevent helpful mutations from taking over.

Yet modern biology has revealed that cells are preternaturally sophisticated assemblages — literally automated, miniaturized factories. How could the evidence have been overwhelming but now orthodoxy ...