Last weekend I put together an Investigation for Unit 5 Lesson 1.  It is posted on the main moodle site for your use. 

I want to see if the students can come up with the concepts on their own instead of just looking at the summary chart at the end of the lesson.

Please let me know what you think.  My students will be doing it next week.  I will keep you updated.

I have also added a Hermoine puzzle in the Unit 1: Set Theory section of the main site.  I have not used it yet, so please let me know if it is any good.