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Mars Exploration Program director Donna Shirley poses Tuesday, July 8, 1997, at NASA's Jet Propulsion Laboratory in Pasadena, California, with Mattel's Hot Wheels Sojourner Mars Rover Action Pack. A supply of 1,500 of the $5 items sold out in 20 minutes Tuesday at JPL's souvenir shop. (KEYSTONE/AP Photo/Kevork Djansezian)