When I was in the Army, I took a week of "charm school" (or maybe just 3 days) on how to be an instructor. One of their things was transparencies, sometimes known as Vue-graphs. I think IBM was well known for using them, along with other graphic aids. Move the clock forward about 30 years and Powerpoint became the big deal. But move another 15-20 years and skepticism builds.
Margaret Soltan at University Diaries reports the possible death of the Powerpoint presentation. But even better is a link in the comments, showing Abraham Lincoln in modern dress.
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