Crystallized intelligence is the ability to use experience, knowledge and the products of lifelong education that have been stored in long-term memory. It is the ability to make analogies and comparisons about things you have studied before. Crystallized intelligence accumulates over the years and leads ultimately to understanding and wisdom.
The online world is brand new, but it feels more fun, effortless and natural than the offline world of reading and discussion. It nurtures agility, but there is clear evidence by now that it encourages a fast mental rhythm that undermines the ability to explore narrative, and place people, ideas and events in wider contexts.