This activity, students get to have fun while also teaching or reviewing the scientific method, graphing, and measurement. Students get to use soapy water and straws to blow bubbles on their table top. Bonus: your tables will be really clean at the end of the day! The engagement level has been very high every time I've used this activity. Kids love trying to see how they can get the biggest bubble possible.
I've included two versions with this purchase. One version is very direct in the procedures, while the other allows for students to have more choice in what independent variable they would like to test.