In this lesson, students learn that sometimes mixing two different ingredients together can form a new substance. The lesson begins with a story about baking and a discussion of how some ingredients in a cake taste very different than the cake. Students then experience their own chemical reaction by creating silly putty by mixing glue and liquid starch together. Students then are asked to compare and contrast silly putty to different familiar objects to better understand the new characteristics of this fun material. Students leave with their own Silly Putty and a note to parents explaining the activity, suggested questions to ask their child, and an easy Silly Putty recipe to try at home.