Waste Heat to Power

This one is kinda interesting;
From NPR:

A Lot Of Heat Is Wasted, So Why Not Convert It Into Power?

"One factor working in Scullin's favor: There's plenty of waste heat out there to be harvested. "We waste heat because of the laws of thermodynamics," he says.

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Those laws state that it's impossible to use the energy in fuel to power a car or generate electricity without some of that energy going to waste.

"Thermoelectrics haven't attracted much attention in the alternative-energy world, but Scullin seems to be drawn to areas others have overlooked."