I am interested in making a make shift project out of this. For science as the kids need to learn all about energy force and the such. I came up blank trying to explain it all to a class of fifth graders. The respose I recieved were great, but it's too techincal for the kids in class.

What are they for and how do you use it?

Is there an easy way to connect our phones so we can talk to each other by using them?

Without buying anything