February 8, 2012 7:52 pm Swarm of Mosquitoes? Nope, a Quad Rotor Three men in the engineering department at The University of Pennsylvania made a little thing they call a quad rotor. They may be little, but they have big potential. US & World Videos 2:42 Search continues for missing kayaker along Schuylkill River 2:26 Beloved cheesesteak shop Jim's Steaks reopens 2:21 Man sprays liquid on tents of pro-Palestinian protesters at Penn, police say 2:05 Wednesday's Child: Gianna 10:45 ‘Giant Heart' procedure: The Lineup