Sigmund Freud wrote that "there is nothing of which we are more certain than the feeling of our self, our own ego." Yet it is difficult to be quite so certain that anyone else possesses consciousness, much less other creatures, because there is no outward physical evidence that consciousness as we experience it exists. The thing of which we are most certain is beyond the reach of our science, supposedly our surest way of knowing anything.
( Michael Pollan )
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