On Aug 13, 8:38 pm, John Harshman <jharshman.diespam...@pacbell.net>
wrote:

K_h wrote:

Fermi's paradox suggests that there are little or no other intelligent
civilizations within the Milky Way galaxy.  On the other hand, intelligent
life should exist on a substantial fraction of planets with life because
natural selection broadly increases intelligence with time.

Does it? News to me. What evidence do you have that this is the case?

There has been an increase in the intelligence of a broad range of
species on earth with time.