Bioinformatics python capstone lesson

This lesson is intended to be a 1.5 hour demo that will sit at the end of a novice python bootcamp and show learners how to apply some of their new skills to bioinformatics. Currently work in progress, contributions/suggestions very welcome!
But these 10 features would be 10 CpG islands? Maybe this isn't important, but I'm confused about how these are called such that there can be many overlapping.