Create these #STEMontheCheap harmonicas using large craft sticks, rubber bands, index cards, tape, and straws. Then, let young engineers decide which design is better. Encourage them to support their claim with evidence!
Continue the engineering by allowing young engineers to make modifications to the designs, test them, and determine (with support of evidence) whether their modifications have improved the performance and/or aesthetic of the Tongue Depressor Harmonica. Consider using the IDEAS Engineering Journal to document their modifications and findings.