Shape-Shifting Metals Could Generate Electricity from Wasted Heat
A prototype waste-heat engine runs by cycling hot and cold water through its pistons​
By Nick Stockton on December 4, 2017
Half a decade ago a scientist, an engineer and a businessman met in a Dublin backyard to conduct an experiment. They heated water in an electric tea maker, then poured it into a bisected segment of pipe. At the bottom of the half-pipe lay a length of wire, and one of the men held a ruler next to it. As the hot water gushed through the pipe, the wire shortened by several centimeters; when they poured cold water over it, it returned to its original length. The trio thought they might be onto something big.
https://www.scientificamerican.com/article/shape-shifting-metals-could-generate-electricity-from-wasted-heat/
