The Sierpinski Pyramid is a fun wayto teach students about tetrahedrons and other 3-D shapes.
Goal: construct a pyramid comprised of equilateral tetrahedrons.  
Learning Outcomes: geometrical construction; equilateral triangles and fractals.
Grade levels: 3rd - 8th grade
 
EF Toolbox includes a kit with all project materials. (except hot glue gun)
 
EF Toolbox also comes with: 
How to build instructions with photos
Factsheet explaining the science behind the project 
Note to parents explaning project