May 1, 2009 8:00 am The Teacher Says: Pay if Forward NBC 10 Today’s Aditi Roy finds some big hearts at an elementary school in Bucks County and asks them how it pays off to pay it forward. US & World Videos 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 1:47 New nationwide Xfinity ad features 3 Vietnam War vets as Military Appreciation Month begins 1:08 Philly police believe teenage girl stabbed grandmother to death inside rowhome