A new virtual reality video game puts players into one of the Twin Towers during 9/11.  Players try to escape the flaming towers.  The developers defend their game as art while others warn of the potential danger of these new virtual reality games.  It's hard to imagine what was going on in the minds of the victims of 9/11 near the top of an inescapable building.  But a new video game tries to give players that answer.