Another reason why books are not as good as online resources is that books cannot be edited once they are published, and thus any mistakes made are forever attached to the pages within.
Cnet News has the details.
Those who have voiced skepticism over the reliability of information found in Wikipedia should take note of this.
The collaboratively assembled encyclopedia maintains a page devoted to correcting errors in its chief offline competitor, the venerable Encyclopedia Britannica.
Have you seen this before? It’s a number guessing game: http://www.amblesideprimary.com/ambleweb/mentalmaths/guessthenumber.html. I guessed 67074, and it got it right! Pretty neat.