This combination of Associated Press file photos shows Steven Herman, left, head of the Library of Congress storage facility, at the Library of Congress in 2003, in Washington, and left, a "bookBot", an automated retrieval system at the James B. Hunt Jr. Library at North Carolina State University in 2013, in Raleigh, N.C. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)

Associated Press
This combination of Associated Press file photos shows Steven Herman, left, head of the Library of Congress storage facility, at the Library of Congress in 2003, in Washington,  and left, a "bookBot", an automated retrieval system at the James B. Hunt Jr. Library at North Carolina State University in 2013, in Raleigh, N.C. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)
This combination of Associated Press file photos shows Steven Herman, left, head of the Library of Congress storage facility, at the Library of Congress in 2003, in Washington, and left, a "bookBot", an automated retrieval system at the James B. Hunt Jr. Library at North Carolina State University in 2013, in Raleigh, N.C. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)
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