A visitor looks at a display of cross sections of the human body at the Perot Museum of Nature and Science during a media preview in Dallas, Wednesday, Nov. 14, 2012. The museum set to open Dec. 1 was named for billionaire former presidential candidate Ross Perot and his wife, Margot, after their five children made a $50 million gift in honor of them. (AP Photo/LM Otero)

Associated Press
A visitor looks at a display of cross sections of the human body at the Perot Museum of Nature and Science during a media preview  in Dallas, Wednesday, Nov. 14, 2012.  The museum set to open Dec. 1 was named for billionaire former presidential candidate Ross Perot and his wife, Margot, after their five children made a $50 million gift in honor of them. (AP Photo/LM Otero)
A visitor looks at a display of cross sections of the human body at the Perot Museum of Nature and Science during a media preview in Dallas, Wednesday, Nov. 14, 2012. The museum set to open Dec. 1 was named for billionaire former presidential candidate Ross Perot and his wife, Margot, after their five children made a $50 million gift in honor of them. (AP Photo/LM Otero)
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