We cannot possible imagine the power of the human brain. The complexity of this biological wonder is far too great for us to understand at this present time. The difference between the brain, and an Itanium 2 is that the brain has the functionality to adapt and evolve with time, be self aware and learn. We cannot imagine the true computing power of something like the brain until we truly understand how a network of neurons store information and process it with the relative speed and reliability that it has.