You can prove anything you want by coldly logical reason — if you pick the proper postulates. We have ours and Cutie has his. - Isaac Asimov

centuries would yet pass before the mighty works of fifty generations of humans would decay past use. Only the declining powers of men, themselves, rendered them useless now.

People who want to do so can lose weight most safely and permanently if they realize that above all they must be patient. ... It is better to eat a little less at each meal than impulse would suggest and to do that constantly. Add to this a little more exercise or activity than impulse suggests and keep that up constantly too. A few less calories taken in each day and a few more used up will decrease weight, slowly, to be sure, but without undue misery. And with better long-range results too.

And it was the amount of energy a single human could produce that dictated military potential, standard of living, happiness, and all besides.