The next generation of computers are coming - and they're like nothing we've seen before. Scientists are turning away from silicon chips and instead are using real, wet, squishy, perhaps even living biology to build machines that could change the world forever. Cells, gels and DNA strands are the 'wetware' of the twenty-first century. Imagine taking cells from a cancer patient and programming them to be able to detect disease and prompt the body to cure itself. Or how about clothes woven with microchips and nanofibres to form wearable bio-weapons detection systems? Both revolutionary applications may be widespread in just ten years time. Exactly what breed of computer does the future hold? The foremost expert in the field describes how this new technology will change the way we think - not just about computers, but about life itself.