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@debcha

Years and years ago on my blog I asked, "what's the smallest number of species you'd need to run a closed-cycle life support system on a generation ship/space colony?"

It was trick question.

Sure enough, within a few comments the first Space Cadet popped up to say "all you need is blue-green algae! And soy. (Maybe farm tilapia, too.)"

They didn't like it when I asked about robustness, micronutrient recycling, and the trivial human need for variety in diet to stave off boredom …