Costa Concordia, Khan Academy, The Innovator

|After wrecking at sea a year and a half ago, the Italian luxury liner awaits one of the most expensive and daunting salvage operations ever; then, Khan Academy and its free online educational videos are moving into the classroom and across the world. Their goal: to revolutionize how we teach and learn; and, When Jack Dorsey invented Twitter, he changed the way we communicate. Will his company Square change the way we shop?

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