There are many features the distinguish language, but
> IIUC one simple test nobody else has been able to pass yet is the ability
> to discuss something located in the past or future, or simply elsewhere.
Not to argue against the uniqueness of language -- or humans for that matter -- but it is awfully difficult to pin down where that uniqueness lies. Bees, for example, seem to be able to tell other bees about sources of nectar "elsewhere."
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Michael Smith mjs at smithbowen.net http://stopmebeforeivoteagain.org