A 200 years old fraud on which the whole of thermodynamics is predicated:process. The second law of thermodynamics is clearly violated.
"A NECESSARY component of a heat engine...is that two temperatures are involved" http://physics.bu.edu/~duffy/py105/Heatengines.html
"Two temperatures" are by no means "necessary". Isothermal (one-temperature) heat engines are commonplace - e.g. pH-sensitive polymers can do work, at the expense of ambient heat, as they swell or contract. No "two temperatures" involved:
By adding and removing hydrogen ions (H+) one can cyclically extract work from pH-sensitive polymers - see Fig. 4 on p. 15 here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1367611/pdf/biophysj00645-0017.pdf
Addingnd removing H+, per se, consumes no work if done QUASISTATICALLY. This means that the work lost e.g. in adding is compensated by the work gained in removing, and the net work involved is zero. So lifting weights is the net work in the whole
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