Authors:

Apparently there is redundancy in memory: You store the same memory in different parts of your brain for accessing at different speeds. That speed would depend on the frequency of use and the importance of the knowledge.

"Bill Nye the Science Guy: Don't Worry, Your Phone Isn't Making You Dumb". Interview with Wilson Rothman, gizmodo.com. March 19, 2010.
Apparently there is redundancy in memory: You store the same memory in different parts of your brain for accessing at different speeds. That speed would depend on the frequency of use and the importance of the knowledge.