This activity is awesome because allows younger kids to explore science concepts typically reserved for older students while still being fun for all ages. Part of the fun is making the dough. The video for this activity and the links are both really helpful, though I would have appreciated a link or two for purchasing the electrical components. The speaker in the video suggests Radio Shack. Waiting for the supplies for this activity if you're ordering allows for time to introduce the science concepts leading up to performing the activity.