Do you ever get that sense of deja vu...a feeling that you've experienced something before? As computers get more and more complex, they are able to replicate the nature of reality in ever finer detail. How would we recognize if we were living in a computer simulation - a highly accurate world of virtual reality? Perhaps this isn't your first time...
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Used availability for David Brin's Reality Check
June 2012 : USA, Canada, UK Kindle edition