At Tsinghua University in Beijing, China, all eyes are on Professor Yuanchun Shi. But it's not the computer scientist's lecture that's so riveting-it's how she's giving it. One wall of her "smart classroom" displays photos of students at other universities across China who have logged in. Shi poses a question and calls on a remote student by shining a laser pointer on his photo. "Go ahead," the teacher says. The student's picture switches to live video and audio as he answers. Shi writes on a digital whiteboard that transmits her handwriting to the students' computers, complementing audio and visual feeds from cameras and microphones.

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