Professor Questions Students by Computer in Class

While he's lecturing, William F. Junkin likes to track his students' progress. But he's not keen about putting them on the spot with a pop question.

"If I ask a question in class, all the students stop thinking and turn to watch the student squirm," says Mr. Junkin, a physics professor at Erskine College, in South Carolina.

"If they give a bad answer," he adds, "they'll hate me, and they're not going to learn any physics. It's a lose-lose situation."

So Mr. Junkin, who is

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