A computer virus that bombards you with pop-up ads is one thing. A computer virus that shuts down a city s electric grid is another. Welcome to the new generation of cybercrime. Discover what it will take to protect our power, communication and transportation systems as scientists try to stay ahead of hackers in an ever-escalating game of cat and mouse. With Seth Shostak, Molly Bentley, Ray Sims, Eric Chien, Paul Jacobs, Shankar Sastry, and Nicholas Carr. From Pacifica Radio.