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I am often newly amazed at the mushrooming capacity of the Web. I found this by following a link on the opening page of Firefox. Their tag-line is create and connect,

Learning Never Stops is a site that offers a wide variety of current events articles for students to read. Users can browse for articles by searching one of their eight categories and many articles come with ready made quizzes. What separates Newsela from other sites is the ability to set the articles to varying reading levels.