Test the strength of the triangle by creating this tetrahedron out of toothpicks and gumdrops.
Push the tips of 3 toothpicks into 3 gumdrops to create a basic triangle.

With 2 more toothpicks and another gumdrop, attach an adjoining triangle.
Add more and more triangles to build a bridge or a tower -- then test its strength by seeing how many CDs it can hold.