Two scientists have put forward the intriguing yet disturbing notion that we may all be living in the Matrix. The idea that mankind could be living in a computer simulation was explored at length in the Wachowskis' science-fiction favorite The Matrix, but just how plausible is this concept ? If we were living in a simulated reality, would we even be able to tell the difference ? It's an idea that was recently discussed by Julian Keith and Curry Guinn - two University of North Carolina professors whose research has focused on the concept of reality and how we perceive it. When you think of computer simulations, we've already made some pretty extreme technological leaps within a relatively short space of time. Look at today's video games and compare them to Pong - imagine what sort of worlds it will be possible to generate thousands of years from now. Sooner or later, we won't even be able to tell the difference between simulation and reality. It's an idea that has been proposed before,