Inquirer Staff Writer Marie McCullough talks about the new contest that the City of Philadelphia will have a chance to participate in, the MyHeartMap Challenge. A project of the University of Pennsylvania, its objective is to encourage people to map the locations of automated external defibrillators (AEDs) with the free iPhone application developed by Azavea. This app will allow participants to transmit photos and locations of the city's estimated 5,000 AEDs. Not only will participants have a chance to win cash prizes up to $10,000, but they will also help in saving the lives of cardiac-arrest victims. Read more about the MyHeartMap Challenge here.