So, my friend Gerry Scott and I are talking about how people wander around in a mobile-device-addiction haze. He said this very morning he saw someone step right in front of a city bus while texting on their iPhone. The guy behind him caught his collar and yanked the hapless pedestrian out of the way... and the fellow turned on his saviour and yelled, "What the hell are you doing?" Gerry intervened, and said, "You were almost killed there, buddy -- you stepped right in front of a bus." Gerry said the guy was stunned -- he had had no idea a bus was nearby. Which leads to my multi-million dollar invention: an IPhone app that alerts you when something is about to hit you . That way, you never, ever have to look up. You already have text there, sports scores, weather, your current location, voice mail, e-mail, and that beautiful sunset in the distance, why, you have a screensaver just like that! If I can just make this little app that flashes up and says, "Step...