The human brain has been called the most complex object in the known universe, and in many ways it's the final frontier of science. A hundred billion neurons, close to a quadrillion connections between them, and we don't even fully understand a single cell.

Neuroscience aims to understand how a person arises out of a clump of squishy matter. It's where psychology meets biology. And with new tools at our disposal—computer simulations, medical imaging—we double our knowledge every decade. Roll up your sleeves and poke around.