My favorite website is http://es.wikibooks.org . I knew this website because I can always answer my questions on various topics, for example: science in general, physics, mathematics, philosopy, history and many topics!.
I visit this website every day because always i have questions to resolve. My favorite topics are mathematics because I can enhance my knowledge and always find good tips.
I hope that this site will be as useful as I have been me.
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