We watched the BrainPop video on Classification and took the quiz. We also watched the Crash Course Biology video on Taxonomy. My 6 yo commented that he didn't really understand much of the Crash Course video, but I figure it is still exposure and good for something. Plus I'm sure that the older two picked up more from it. There is also a BrainPop Jr video that we didn't watch but might as a review next week.