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Georgia State University students who don’t want to yell their questions from the back of a cavernous lecture hall now have another option: They can send text messages to their professor, who reads the queries from an overhead screen.

Text-messaged questions, McDonald said, are compiled on a class web page—known as a wiki—where other students can answer the questions. “It creates a knowledge base, and a knowledge base has real power,” he said. “And students love to show how smart they are.”