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Brainball

Rory Reshovsky, 10 (left), and Taylor Bruce play Brainball, an interactive game, at WIRED NextFest Sept. 13, 2007, in the Los Angeles Convention Center. The players wear brainwave-detecting headbands, which monitor their stress level, indicating alpha and theta waves. The data is reported to a computer that directs the ball away from the calm person. (AP Photo/Ric Francis)