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A robot used to explore ruins in Teotihuacan, Mexico, sits on the ground Wednesday, Nov. 10, 2010. The small foot-wide wheeled vehicle, able to record video, entered a 2,000-year-old tunnel found earlier this year under the ruins of the temples of Teotihuacan. (AP Photo/Alexandre Meneghini)
Photo by: Alexandre Meneghini
A robot used to explore ruins in Teotihuacan, Mexico, sits on the ground Wednesday, Nov. 10, 2010. The small foot-wide wheeled vehicle, able to record video, entered a 2,000-year-old tunnel found earlier this year under the ruins of the temples of Teotihuacan. (AP Photo/Alexandre Meneghini)

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