Scott Alexander shares his thoughts about Robin Hanson's "Great Filter", which refers to a factor which weeds out civilizations in the universe, thus explaining why we don't observe more (really, any) advanced spacefaring civilizations in the known universe. Alexander argues that none of the so-called "late filters" proposed are very likely, and so we should not fear a late filter (and perhaps should feel some relief that we have passed beyond a hypothetical early filter?).
This blog post is remarkable, not least because of the fact that the comments are just as good if not better than the post itself (how often has this happened in the whole history of the internet?).
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