The fridge itself consists of an offset wheel of rubber bands. The bands are stretched outside the fridge, and released inside. Two fans help transfer the thermal energy from the bands to the air.

Egged on by adoring fans who demanded more aircraft ... off was that of rubber band power. By winding a rubber band, it could store enough energy to turn a propeller for a short duration.

Students stretch pre-cut rubber bands to their lips, stretch the rubber bands, and then allow them to contract. The rubber bands grow warmer as they expand and cool as they contract. To Conduct ...