Listen. Do you hear that click-press-patter of fingertips on a keyboard? Is it interrupting the lecture? Is the student taking notes or emailing a friend?

Pause for a moment. Scan the classroom. Are the downward faces tilted toward a glass screen? Does a soft glow emanate from below desks as statuses update, are liked, and text messages sent? A phone is held out. Is a picture being taken of the whiteboard and loaded into Evernote or is a video being recorded to be uploaded to Youtube.
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