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The U.S. military wants to have robotic eyes in the sky constantly roving and watching what goes on below, 24 hours a day, seven days a week. They might achieve that capability very soon, as a test vehicle called the Zephyr just obliterated the old endurance record for an Unmanned Aerial Vehicle (UAV), nearly tripling the previous record. How did the Zephyr stay aloft for so long? More »
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