The idea of a "personal submarine", IMHO, should be more along the lines of this kind of thing. Just build it yourself !

the animals themselves were lean animals

Do you mean lean like wild american buffalos, camels, et al. who pretty much all have a huge slab of fat on the back ? Or lean like salmons and whales and seals, with fat packed under the skin ? Also, they always ate the brain and bone marrow, which are almost pure fat too.

Also, people during that age were not especially healthy. They probably died in their 40s.

Wrong. Half of them died young (typically before the age of 5) and the rest lived to their 60s and 70s, sometimes even older. Reconstructed modal age for primitive hunter-gatherers is 62 to 64 years of age.

There is a marked reduction in average size, and sudden appearance of generalized tooth decay, traces from infectious diseases and formerly absent bone deformities in our record of skeletons from the paleolithic to neolithic transition. Granted, the infectious disease became more widespread because of the growing densities of populations at the time, but the rest has been determined to come from the evolution of the diet. There is also a reduction of serious injuries observed, because less hunting decreased the exposition to dangerous predators and hunting accidents.

As for life expectancy, it decreased slightly with the agricultural revolution until circa 2000 BC, at which point advances in hygiene, sanitation, productivity and trade compensated for the difference. And we only now have caught up the loss in average height. There has been evidence of an adaptation to agricultural diets over time, but its effect is still small in terms of life expectancy.

I wonder if similar critters could survive in the liquid methane lakes and rivers of Titan ?

Economists say it is impossible.

Citation needed.

Maybe instead of automating the grunt work, we need now to automate the automating itself, so that the high-tech tools become just as cheap and prevalent, affordable to every small-scale farm, as the food grown with those tools.

They're called ultralights. Same price range (well, sorta, you may have to double or triple the tag), same kind of performance and mileage.

Thanks for the reference, this is all interesting. It seems to confirm that equality has a lot to do with the level of dissemination of information (and other forms of capital). The 'heavy handed" approaches concentrate it, and thus reinforce hierarchies, whereas the "light handed" approaches disseminate it around which dissolves hierarchies.

I went and examined the paper, and damn right the /. summary is misleading.

First one, the researchers don't use the vague term "social inequality". Second, they are merely reporting on the results of a computer model, and not on some new archeological findings. From the abstract:

We model the coevolution of individual preferences for hierarchy alongside the degree of despotism of leaders, and the dispersal preferences of followers. We show that voluntary leadership without coercion can evolve in small groups, when leaders help to solve coordination problems related to resource production.

They did a computer simulation of the classic Coase argument about transaction costs affecting market structure (and its consequences on asymetry of information which equate to inequalities of human capital), applying it to individuals undergoing the agricultural revolution (food surpluses but with delayed returns and higher need for coordination). Well, yeah, a hierarchy emerges in this situation, because the rapid change in productivity is not uniformly distributed and depends on information that is costly to disseminate. That idea's been around at least since Hayek's works on spontaneous order. It's kinda nice to see it verified in a computer model, but it doesn't teach us anything new.

As long as we're talking about places on Earth, and not space or other planets / moons, I might as well be exploring its sky. There's no joy like flying free !

That's domestication for you... You can be pretty sure that guinea fowls, which have kept more of their hunting instinct, would have made short work of the mouse.

That said, from the point of view of the mouse that whole scene must have played much like something out of Jurassic Park 2 or 3.

Thank you for having actually RTFA and ephasized the really significant part of it (to the current debate).

Administrative takeover of corporations by autoritative central state, with intimidation through abuse of executive power, is textbook fascism. Mussolini would be proud.