Top Hat lets Bazylak modify and tweak his lecture in real time. After each subject segment, Bazylak uses the app to text the class a multiple-choice question they can answer on their cell phones. If 96% or more of the class gets it right, he moves on to the next topic. If they don't, he continues on the same topic until he's certain the class has grasped it.
Top Hat, for instance, costs students roughly a semester; Bazylak requires them to buy it the same way he might require purchase of a textbook.
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