Art Machine K-5th Art Machines are kinetic sculptures designed and built to move. Learners connect levers and fulcra into a machine that stretches out and pulls... $8.95 Wind-Up Vehicle 2nd-8th Learners build a car powered by a wind-up spring, then take it apart and invent a vehicle all their own. There are no batteries, no wiring, an... $8.95 Flying Machine 1st-8th Learners build a rubber-band-powered flyer, draw and cut their own symmetrical wings, and launch it again and again to see how each design fli... $8.95