The group discusses whether a charged balloon will pick up small pieces of paper and aluminum. Based on their prior experiences they decide it should pick up both. The first time they try the experiment they see only aluminum being picked up and so try it again. Erin's hair becomes charged while rubbing the balloon on it. In discussing how to discharge her hair April recalls some advice from her mother that makes sense to her now!
While her presentation board is shown a student off camera reads her explanation for how charged plates work to remove neutral dust particles from the air. Since her group assumed the plates were negatively charged the instructor asks a group that assumed positively charged plates to comment.