Technology that overlays digital content on top of real-world surroundings on a mobile device is being used by more schools to enhance classroom lessons. Augmented-reality technology allows users to view virtual objects such as planets, volcanoes or the human heart in a real-world context, interacting with or making changes to the objects as part of a lesson. "AR raises the level of interaction for the students," said one Arkansas teacher whose students used the technology to create a virtual tour of the Bill Clinton presidential library. "The kids love it because they are active."

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