Computer worms like Code Red can be used to find potential zombies and automatically install the attack software.

The AI software examined millions of potential antenna designs before settling on a final one. Through a process patterned after Darwin's 'survival of the fittest,' the strongest designs survive and the less capable do not.

Further, the next generation of terrorists will grow up in a digital world, with ever more powerful and easy-to-use hacking tools at their disposal.

While many hackers have the knowledge, skills, and tools to attack computer systems, they generally lack the motivation to cause violence or severe economic or social harm.

I don't have a particular recommendation other than that we base decisions on as much hard data as possible. We need to carefully look at all the options and all their ramifications in making our decisions.

We have never really had absolute privacy with our records or our electronic communications - government agencies have always been able to gain access with appropriate court orders.