When we look at the world around us, we see a wonderous variety of living things—with fins, fronds or feet, living in the deepest ocean or the driest deserts, eating seeds or salmon or sunlight. The ...

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 ...

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 ...