This activity is differentiated on 3 levels. Students must read a number of sentences and determine which sentence is the main idea, which are the many details that support the main idea, and which sentences must be discarded. As the difficulty level increases, the sentences to b discarded become more and more tricky to eliminate. The beginner level has sentences that are very irrelevant, but as it gets more advanced, the subject becomes a bit more subtle, and it requires higher level thinking s