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Robots and computers are already replacing workers in factories and offices. Now engineers are developing intelligent machines to do farm work and help ease a worsening labor shortage on American farms. See the engineers test the Lettuce Bot, a machine that can "thin" a field of lettuce in the time it takes about 20 workers to do the job by hand.

Have any comments or questions about our video editions of IMPO? Or do you have a video you'd like to see featured in one of our deployments? Email me at Rachel.Immel@advantagemedia.com.

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