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A few comments on ChrisA's post:
1. The birth rate in the "middle class" declines because the middle class tries to be self-sufficient...
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The declining birth rate is not a problem that can't be dealt with directly. And, anyway, it seems to be a result of socioeconomic...
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And the complexity is even bigger...
There's manufacturing. Equipment on the ship will wear down / break down over time. Tools and...
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Perhaps a way to skirt the generational travel time issue is to devise a true means of cryostasis, and/or have that method reserved for...
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One huge problem. Almost every first-world country now has a birth rate less than 2.1. This means their population is shrinking...
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