The single simplest reason why human space flight is necessary is this, stated as plainly as possible: keeping all your breeding pairs in one place is a retarded way to run a species.
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Warren Ellis [wired.co.uk] via
bdunbar That's the long look and one I very heartily agree with. In the short term it means the US gets to thumb a rid on a Soyuz every time we want to take a road trip the ISS.