Tiggy you are without a doubt the most self-centered, arrogant, person I have ever had the displeasure to engage. I gave you a reasonable explanation and you again get condescending and sarcastic.
Science has kept me alive and doing well since 1996. Unlike some I doubt science will ever find a cure for AIDS so your analysis is lame and just plain idiotic.
"Here we go round the mulberry bush" with tiggy and her cohorts coming back with double talk and no answer in response to a direct answer.
No wonder you people have jumped on Darwinian evolution; you can excuse your lack of real scientific information and knowledge with "well it evolved".
How is the "blind spot" in the human eye detrimental, and does a cephalopod have depth of field?