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Edited by FatherlyNick: 1/9/2015 1:01:18 AMWhat DOES exist then? We have to have some sort of a priory knowledge to which we can relate. If you say that you believe that you exist, we just have to try to satisfy the criteria that helped you establish that you exist. For example, there are the 7 signs of life. If one expresses those, we draw that one is alive.
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We don't know. Nothing can really be proven to be "real".