I really love stirling engines. Even built a model that works. (barely)
And the thermoacoustic ones are genius on top of genius. I just hope this technology really matures and gets affordable.
Till then one can still have a small thermoelectric generator.
First, you drop a couch from the plane, THEN you surf it. Here, take this tiny ad with you:
grow your own garden and build your own home in the gardening gardeners program