Technically, only one type of projection equipment – transmissive – qualifies as overhead projection, but the lines between competing analog presentation methods blur when less-experienced presenters ...

Whether you give presentations for a living or attend them only at seminars, you've probably sat through hours of digital slides and scenarios, overhead-projector transparencies and bullet points.

A key to keeping students on task is closing their window of opportunity to get off task. And never is that window more wide open than when you turn your back to write on the board. Case in point, my ...