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!
I'm confused about what is merging on... it merges different features that overlap in location? It kind of seemed like it might be overlap in feature name or something? Maybe clarify it is just location based.