Wikipedia - The most popular internet encyclopedia. What can we tell for it , there is a hige amount of information for everything - we can start with cars and end with Quantom Physics. The autobiographies of popular people , absolutely everything you can imagine. If you need an information for something the first association which you relate with is Wikipedia.
Very good fact is -Wikipidia is FREE encyclopedia , and always will be.
The information is not always full and right , but when you need a sourse of information you think first for wikipedia.
Nothing can stop the people who want ,,to know'' everything.