March 29, 2013 8:44 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 1:36 Arizona Senate repeals 1864 abortion ban 1:40 Democrats say Big Oil misled public for decades about climate change 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look