Step 1: Tops
For added longevity, encourage your students to make a top that can out-spin all the others.
Please limit the number of tops your students use to a reasonable number (5 or less).
By operating these simple tops, students will have a visual understanding of how the gyroscopic effect can keep an otherwise unstable object upright.
Experimenting with the top design will give students insight into concepts such as symmetry and center of gravity.
Wheels can be purchased here.