priceless ?
if nothing was paid it could also be called 'free', or 'without value'
3 pieces, ooof; I've hundreds and would not conclude the technology is a dead end, merely not yet developed
the marketplace is illustrating your valid conclusion, as of this time
and tomorrow ?
what your in-depth research possibly failed to identify were the creation of microclimates, and the means of enhancement of same; and there are some physics issues relating to the heat transfer mechanism itself
- now it is a brand new game, now being researched - and patented
end of my comments on such
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