Early elementary aged visitors can identify the ingredients needed to make a bubble (soap, water and air), and can describe the characteristics of a bubble (round, shiny, wet).

Early elementary aged children can think about whether- and why- bubbles are always round.
Early Elementary aged children can also participate in some of the challenges- such as “touch a bubble without popping it”- and consider how they accomplished this surprising result.
*Grownups- the trick is to "make your finger like a bubble" and wet it in the soap solution before trying to touch the bubble, but sssh- don't tell!*
Early elementary aged visitors can use all the tools available to make a bubble.
They can try to “release” a bubble from the end of the cup, allowing the bubble to float freely.
Early Elementary aged visitors can try to design their own bubble tools, using straws and string, to create different shapes or giant bubbles.