There was a time when I used to catch up on some reading while giving an exam. Today, I'm in the lab and my students have an additional 25 minutes to work on their midterm examinations. This type of intense writing can make anyone tired and I can see by their expressions that the work is taking its toll.
Today, while they've been busy I've been creating some teaching materials. Actually, I've been viewing segments from How It's Made and making a short comprehension worksheet to go with each one. If you look at the sample, you'll see it doesn't look as if it'd be taxing to create. After doing a few though, I'm wondering what expression is on my face.