The difference beween reading then (pre-internet) and now. Breadth vs. depth.
cogsciresearch.blogspot.com
cogsciresearch.blogspot.com
Nowadays, aggregators (like HN) and websites like Wikipedia have insane amounts of varying knowledge on many topics which are packed tightly together. We often click on that stray link which may lead us to future immersion into a topic or, more commonly, a quick skim of an article.
The result is knowing little about a lot of different things. While the latter graph may still Internet users, the large gaps should be filled instead by many little bars.
Probably could be said that I spend more time reading in this way than I should though, its a fine line between staying on top of everything and putting yourself in a place to get things done.