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Robots open up the world of art

|The De Young, one of San Francisco’s fine art museums, now has two robots that open the museum up to those who cannot attend, including the physically handicapped. John Blackstone reports on the state-of-the-art in museum tour guides, and interviews robotics activist Henry Evans, a former Silicon Valley executive who is now almost completely paralyzed, and who worked with the museum to make touring by robot a reality.