Great Philly PR in today's Wall Street Journal. Read "High priest of app design at home in Philly," by Jessica E. Lessin. When you are using an app and pull down on the screen to refresh -- you know that maneuver? It was invented by Loren Brichter, who lives in Philadelphia. Even though that would be enough to be a geek god, it's not the only thing he's invented. Read for the details.