|More than 5,000 houses have been destroyed by bushfire over the last 30 years. This video clip takes a close look at this problem in Australia, where there are more than half-million houses near large areas of bushland. Meet Justin Leonard. He's surveyed the aftermath of every major bushfire in Australia since the Canberra firestorm of 2003. He shares what he's learned and how houses in dangerous areas can be built differently.