[caption id="attachment_32947" align="alignleft" width="150" caption="Clicker technology has advanced, but some professors prefer simpler models that won't lead to distractions."]Clicker technology has advanced, but some professors prefer simpler models that won't lead to distractions.[/caption]

The students in Michael Dubson’s physics class at the University of Colorado fell silent as a multiple-choice question flashed on a screen, sending them scrambling for small white devices on their desks.

Within seconds, a monitor on Dubson’s desk told him that 92 percent of the class had correctly answered the question on kinetic energy, a sign that they grasped...

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