Educational videos from TED

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Feb 6, 2011 1:09 pm Ms.Parkhurst Ms.Parkhurst
Feb 6, 2011 1:00 pm Ms.Parkhurst Ms.Parkhurst
Feb 6, 2011 12:23 pm Ms.Parkhurst Ms.Parkhurst
Feb 6, 2011 12:22 pm Ms.Parkhurst Ms.Parkhurst
Feb 6, 2011 12:21 pm Ms.Parkhurst Ms.Parkhurst