University Park, Pa. -- THON 2009 began Friday, Feb. 20, in the Bryce Jordan Center on Penn State's University Park campus. The 46-hour Penn State IFC/Panhellenic Dance Marathon, the largest student-run philanthropy in the world, benefits the Four Diamonds Fund at the Penn State Milton S. Hershey Medical Center, benefitting children with pediatric cancer and their families. For photos, visit http://live.psu.edu/stilllife/1978 online.