To go along with out Egg Unit, I found a Peeps Experiment on Pinterest. It is from Mom to 2 Posh Lil Divas. We used five Peeps, water, vinegar, apple juice, soda, and laundry detergent. And, because we are teachers, I created a recording sheet for this experiment, get it here for free! The students recorded how the Peeps changed in appearance each day over one school week.