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I would consider sentience(consciesness) pretty much a must for any species to evolve to the next level....as it seems the natural step after tool use and speech, if not before. Without it we would likely have already been replaced by bugs with high level thought or even more likely by cetaceans. Who knows, dolphins and whales may be sentient in many ways, we just dont care enouph to find out. We wont really know the true plus or minus for centuries or mellinia....if indeed we make it that long.
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Holding onto anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned. - Buddha
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