"David Cox sent his students through Function Carnival where they tried to graph the motion of different carnival rides. (Try it!)
Every student's initial graph was wrong. No one got it exactly right the first time. But Function Carnival doesn't display a percent score or hint tokens or some kind of Bayesian probability they'll get the next graph right. It just shows students what their graph means for that ride. Then it lets them revise."
"Reactions filmed with a high-speed camera. New videos being added every week."
Could be interesting to look at the reaction in regular speed and have students discuss: "What do you notice and wonder?"
Then, play the slow mo videos and see what sort of observations pop up.