> Given that we get a stable crust ~4 billion years ago and life seems
> to appear at 3.86 billion years ago, that says that (a) it either
> came from space (panspermia); or (b) it is easy.
> I believe Robin Hanson has already addressed these issues of the timing
> of the orgin of life vs. the probability of origin in more detail.
Yes, I have. See"Must Early Life Be Easy? The Rythm of Major Evolutionary