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I've had my home address posted for anyone to see since as long as I've been living. It's called a telephone book and this technology lists the names, addresses and phone numbers of virtually every resident of every location. Scary.

Except halfway through the piece, Randy Yerrick — an associate dean of educational tech at the University of Buffalo — makes the take-away point: The chief reason to use high-tech tools is when you want to teach in a fashion that has “no good digital equivalent”. Or to put it another way, only use computers in situations where you want to do something that can’t be done without them.

3) Dialogue. Computers also let teachers and students have dialogues that aren’t easily possible in regular face-to-face formats.

What can computers teach that textbooks and paper can’t?