Link: http://www.economist.com/news/science-and-technology/21716013-replacing-real-world-virtual-one-neat-trick-combining-two http://www.economist.com/news/scie

Link: http://www.economist.com/news/science-and-technology/21716013-replacing-real-world-virtual-one-neat-trick-combining-two http://www.economist.com/news/science-and-technology/2171601...