To increase the capacity of the human brain using direct technology, brings me out in a cold sweat. Surely, as the population continues to grow, what we should be doing is using the Internet to make greater connections between brains of people that would become more and more specialised in smaller portions of subjects. That has a good side effect in that we would all have to learn to work and get along much better.
In nature, Bees, Ants, Termites, Dolphins, Whales, Lions etc. all work together to get their food.
If we have to become reliant on a few people with 'Tefal' heads (
http://www.youtube.com/watch?v=bsNwtBv3PI0), to progress man, what happens if they all come down with the flu at same timetime?