March 29, 2013 10:44 am Teen Builds Hi-Tech “Helping Hand” A Pennsylvania teenager’s prize-winning science fair experiment could end up changing lives. His “Helping Hand” is a voice-controlled robotic grasper that only responds to its assigned user. US & World Videos 5:02 Demolition of I-95 overpass in Norwalk set to begin after fiery crash 2:38 High Schooler donates 7,000 pounds of homegrown produce to Iowa community 9:45 Orlando Bloom says he's shocked he's still alive after filming his new adventure show 9:22 Mississippi nonprofit tackles poverty head-on through radical approach 1:30 SEE IT: Miles of traffic backed up on I-95 and sideroads after fiery crash in Norwalk, Conn.