15259Why did only one intelligent species evolve on earth?
- Oct 25, 2013>> 10/25/2013
> Dear Cecil:
> In sci-fi stories, alien planets often have multiple species of indigenous intelligent life forms, whereas Earth has only one species that is
> much more advanced than others. Why didn&#';t multiple species evolve comparable upper-echelon intelligence at the same time? Is there something inherently
> unlikely with the alien-planet scenario? &#-; Ken in Sherborn, MA
> Cecil replies:
> What makes you think having multiple intelligent species around at the same time is science fiction? On the contrary, some researchers believe, two
> intelligent species once competed to dominate the Earth. Much as today we have normal people duking it out with House Republicans ...
> For more, see:
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