July 16, 2009 3:40 pm Tim Furlong! Tim Furlong visits Tyler Arboretum and it’s popular treehouse exhibit. US & World Videos 2:05 Wednesday's Child: Gianna 10:45 ‘Giant Heart' procedure: The Lineup 0:16 Philadelphia police department combines 2 police districts. This is why 0:36 Franklin Institute's Giant Heart to close for months. Here's what will come next 0:16 Philly's Rocky statue getting a spring cleaning