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I sincerely hope that's not true. That would be unconscionably wasteful. And for what? Incremental improvements in one frivolous function or other? Or do they just not last more than six months? It sounds a bit dubious, given that the contract periods are typically at least a year long.
I detect some ambiguity here. It would sometimes be crappy compared to getting laid by your wife, or be crappy compared to sometimes getting laid by your wife?
Many, many, many, probably in the tens or hundreds of thousands. I have never heard of an even remotely feasible scheme to get a viable atmosphere going on Mars. Without that, the chances of significant or durable colonization are essentially zero.
No. As the population grows, the number of people at the second standard deviation will grow proportionately. By definition.