60 Minutes Overtime, 9.01.13

      |Rare and eerie images of the half-sunken passenger ship marooned off the coast of Tuscany; neurosurgeon and 60 Minutes correspondent Sanjay Gupta attempts a third job: teaching. See Gupta make a video lesson about the human brain with Sal Khan; and, when he dreamed up Twitter, Jack Dorsey never expected that it would change the relationships in his own family.

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