I subbed for a calculus teacher last week. He had recorded a video of himself presenting the material so that all I had to do was press play. I love this idea and I’m going to steal it (more on this in a future post). After showing the 13 minute video and handing out the practice test, I asked the class if they needed anything else from me before they got started. A few students said no, but then a kid from the back of the class spoke up to say “Just the warmup.” Then came the 29 second calculus warmup that brightened my day. It was so great and so out of the blue that I had to have them recreate it for video. Enjoy.