American Educational Products Hubbard Kubic Bubbles, Secondary LevelAllows you to prove Geometry problems This kit allows you to visually "prove" geometry problems and demonstrate light refraction. You can build cubes, octahedrons, tetrahedrons and prisms then dip them in soap glycerin to produce fascinating shapes with the smallest possible surface areas. This kit is an expanded version of the basic Kubic Bubbles (R KB1). It includes all the same materials and instruction sheet as the basic kit but also contains two