As a psychology graduate student I have the opportunity to teach an introductory psychology course. I'm hoping to take what I have learned here and start helping my students improve their rationality. Specifically, I'm planning to have the students read excerpts from Ch 22 & 23 of HPMOR as a fun and interesting way to start learning to think like a scientist. I'm hoping the community can assist me with possibly narrowing down the sections I'm going to have them read and consider possible methods of assessment. As of now, I know that I want to have the students analyze the methodology used by Harry in his two experiments from those chapters (Harry and Hermione testing spells and Harry and Draco "testing" the blood hypotheses), and I probably want to have students come up with their own hypotheses and methods to test them. Any help the community wants to provide is most appreciated.
Khan Academy would probably be your best bet. It's free, it's in a visual medium, and the instructors are incredibly good. You can also find their videos by searching youtube for "Khan Academy ", however, youtube only has the lectures and doesn't have the practice problems. There are lots of other free math tutoring options, but Khan Academy is the only one I know that is accessible to children. (Also this post would probably have been best in this in this month's open thread, but I don't think anyone will mind too much.)
You don't need to leave the site after getting your answer though. There's lots to see here. You might want to check out the welcome thread for new members or take a look at the FAQ to see what we're about.