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Old January 24 2013, 04:18 PM   #22
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Re: wild dolphin seeks out human help

I was thinking about the encoding, and not the range. There is more than one way to embed a meaningful thing in a sound. Some of the known ways to do so are impossible to interpret or detect without a common reference, but thankfully those are always artificial and not something you'd see evolving naturally. It could still be something pretty elusive, though.
Objects in mirror are bluer than they appear
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