Recently, Karen Meyers from the Center of Teaching and Learning talked about an article by Richard Hake in the American Journal of Physics that demonstrates the value of active learning.  This graph that she showed seems appropriate for our class.

One of the main principles in Chapter 2 is that a graph should have Clear Vision which basically means that the message should be clear from reading the graph.  I think there are several problems with this display — can you think what they are?