My school's media specialist recently showed me Newsela and I was awestruck. This website helps students develop close reading and critical thinking skills by offering current event articles with varying levels of text complexity. Lexile levels of an article range from 2nd grade up to 12th grade which allows for differentiation within the same classroom. The articles are categorized by war/peace, science, kids, money, law, health and arts. Many of the articles are accompanied by quizzes that provide quick feedback. Newsela is currently in beta and is free for all teachers. I think you will find Newsela to be a valuable resource for your students.