Now, you might have heard that we know nothing about how the brain and body give rise to consciousness. Some people even say it's beyond the reach of science altogether. But in fact, the last 25 years have seen an explosion of scientific work in this area. If you come to my lab at the University of Sussex, you'll find scientists from all different disciplines and sometimes even philosophers. All of us together trying to understand how consciousness happens and what happens when it goes wrong. And the strategy is very simple. I'd like you to think about consciousness in the way that we've come to think about life. At one time, people thought the property of being alive could not be explained by physics and chemistry — that life had to be more than just mechanism. But people no longer think that. As biologists got on with the job of explaining the properties of living systems in terms of physics and chemistry — things like metabolism, reproduction, homeostasis — the basic mystery of what life is started to fade away, and people didn't propose any more magical solutions, like a force of life or an élan vital. So as with life, so with consciousness. Once we start explaining its properties in terms of things happening inside brains and bodies, the apparently insoluble mystery of what consciousness is should start to fade away. At least that's the plan.