The human brain appeared on earth some five million years ago. It took just a few million more to fully mature, a mere blink on the geological time scale. Structurally, anatomically, the human brain has not changed much in about two hundred thousand years. It is the same brain used by the first Homo sapiens to walk the planet. But what has evolved is the mind. And it is this inner universe that has so mystified and beguiled us. The mind, together with the brain, forms the most complex system kn...