A lot of your mental energy goes to figuring out where does one word end and the next begin.

The only thing going on is the progression of words and sentences across page after page and so suddenly we see this immersive kind of very attentive thinking, whether you are paying attention to a story or to an argument, or whatever. And what we know about the brain is the brain adapts to these types of tools.

As soon as you introduce the mechanical clock, you get a radically different view of time. Suddenly, it's not a flow; it's a series of discreet, precisely measurable units, seconds, minutes, hours, and so forth.

The book, I think, like the map before it, like the clock, created or help create a revolution in the human mind in the way our habits of mind and ultimately the way we use our brains.

We don’t constrain our mental powers when we store new long-term memories. We strengthen them. With each expansion of our memory comes an enlargement of our intelligence. The Web provides a convenient and compelling supplement to personal memory - but when we start using the Web as a substitute for personal memory, by bypassing the inner processes of consolidation, we risk emptying our minds of their riches.

By putting the means of production into the hands of the masses but withholding from those same masses any ownership over the product of their work, Web 2.0 provides an incredibly efficient mechanism to harvest the economic value of the free labor provided by the very, very many and concentrate it into the hands of the very, very few.

The brain likes to be efficient and so even as its strengthening the pathways you're exercising, it's pulling - it's weakening the connections in other ways between the cells that supported old ways of thinking or working or behaving, or whatever that you're not exercising so much.