LAS VEGAS - Hillary Clinton and Bernie Sanders sparred over the merits of capitalism and traded barbs about their credentials on gun control during a tense first Democratic debate.
WASHINGTON - A missile test announced by Iran over the weekend was an apparent violation of a U.N. Security Council resolution and Washington will raise the incident at the United Nations, the U.S. State Department said on Tuesday. | Video
A trio of Chilean student engineers have developed a biocircuit device that can harness plant energy and convert it into small charges of electricity to power smartphones. Ben Gruber reports.