The beauty of the digital world is scalability. Certainly each lecturer that spends 20 minutes doodling this, all combined, is repeating more effort (and &#x27;wasting&#x27; more time) than Steven expended making this presentation.<p>Someone only has to do this once, in the 20+ hours it takes, and any individual student in the world can peruse it. Or any lecturer in the world can make use of it in their class.