My laptop releases an excess amount of heat. Is it practical to be able to attach a some sort of device that can take a good amount of that heat being exhausted by fans in computers and reuse it as energy. There can be something akin to fan blades in the centi to micro scale, and they would extract energy as they are rotated by the accelerated air. Thoughts? What are the engineering/manufacturing problems involved? Or is it just a monetary issue?