Well there are lots of theories on this one. All the way from the Descartes evil demon's illusions, to the brain in a vat scenario. Lots of books cover this, just pick one up at the book store (and this is more like a philosophy question). Either way live you life as if it was real, because odds are you will never know.
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Roses are red, violets are blue, I'm a schizophrenic and so am I.
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