This is very true in practice. I lecture as a part-time professor every so often, and this is one of many good reasons why you should never lecture via powerpoi

This is very true in practice. I lecture as a part-time professor every so often, and this is one of many good reasons why you should never lecture via powerpoint. The act of writing down a thought as it's spoken is an important thing for many people. I do use an electronic Wacom tablet when possible, so that I can at least give out pdfs of the lectures.