On Sat, 11 Sep 1999 firstname.lastname@example.org wrote:
> Or (c) there are multiple hard steps. See Robin Hanson's paper at
> http://hanson.gmu.edu/greatfilter.html. If there are ~5 hard steps
> then it is not surprising that a couple of them took only a few hundred
> million years, if we conditionalize our expectations on the fact that
> we are alive today.
Look at my comments on Robin's paper at: http://www.aeiveos.com/~bradbury/GreatFilter/ Somewhat out of date because of the more recent work I've done.