Now you can perform an experiment at home with construction queen, Camryn Coyle. Make your own wind-up pet robot just using household ingredients like a strawberry or marshmallow.

Picking Up S.T.E.A.M.

Wind-up toys are all about energy. When you turn the key on your robot's base, a thin, coiled strip of metal called a mainspring gets tighter and tighter and squeezes into a smaller and smaller space, storing energy. Once you let go of the key, the potential energy stored up in the mainspring turns into kinetic energy. The connected gears and axles rotate, making your robot zoom!
Project Mc2 Doll with Experiment, Camryn's Wind-Up Pet Robot: