Try "Absence of evidence is not evidence of absence." Reputedly from 
Carl Sagan.

Art Harris

Jansonius, Remko (Vizcaya) wrote:
> Someone on this list once made a very eloquent statement on how the lack
> of evidence does not necessarily prove that something doesn't exist.
> What was it? I can't find the words to say it as elegantly myself ...
> 
>  
> 
> Thanks!
> 
>  
> 
> 
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