Karen Byrne

The 3lb organ between your ears, which has an estimated 86 billion neurons, may be one of the world's most complex structures. All the detail helps the brain process more than 70,000 thoughts per day, but neuroscientists have a headache. Hundreds of different brain regions have been uncovered by study, and the more structures seem to have appeared, the better scientists look. Amazing graphics now reveal the bizarre and wonderful functions of these diverse fields, from the lobes that make your identity to the mysterious origins of speech. So, if you've ever wondered what's going on between your ears, read on to find out how the brain's shape influences your mind and what happens when it goes wrong.