Materials List:
Invent a Backscratcher from Everyday Materials
https://www.teachengineering.org/activities/view/invent_a_backscratcher
- tape
- string
- scrap cardboard
- paper towel tubes
- scissors
- glue
- any other materials you wish to use; students may also bring supplies from home
https://www.teachengineering.org/activities/view/invent_a_backscratcher