Fermi's Paradox

--- In spacesettlers@yahoogroups.com, "William" wrote:
> I think it's mostly that, and maybe perhaps a little of this:
>
> http://accelerating.org/articles/answeringfermiparadox.html

By "that" I meant to say, rare earth/rare intelligence/rare tool
bearing species. No more than let's say 100 in the galaxy. The latter
that I referenced, might perform a kind of mopping-up role.