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Two 7-meter-long sailboats are set to return next month to California, after nearly 8 months tacking across the Pacific Ocean. Puttering along at half-speed, they will be heavy with barnacles and other growth. No captains will be at their helms. These sailboats, outfitted with sensors to probe the ocean, are semiautonomous drones. The voyage is the longest test for the drones and also the first science test in the Pacific. [Source: Science / AAAS]
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