Too many times, students will do a PowerPoint presentation in class which does not really show that they know what they are talking about. Often, students paste together resources they found without really understanding what they found, and instead of learning the content, and being able to evaluate the content (make it their own), they just paste and reread it. This means, they aren’t learning the content you wanted them to learn, and the victims of their presentation aren’t learning either. And all you learned, was that they didn’t learn anything.