It sounds great, Andy and Art! But...
 
What about any Homo sapiens who does not (whether fertile or
not) HAVE grandchildren? They can't be a member of the species
because they did not achieve this criterion.
 
There have been fertile couples who have had children but, due
various reasons, had no grandchild born to their offspring. These
people, also, would not be recognizable as Homo sapiens, having
failed the "true" test of a species.
 
Is there some way to modify this idea to make it more applicable?
Maybe the test for Equus sp. won't work with us.
 
Aloha,
 
makuabob (a.k.a. Bob Dayle)
 
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