| http://www.w3.org/ns/prov#value | - He said it has proved difficult to obtain batteries powerful enough to complete the flight when weather conditions are anything other than fairly flat, and wind has also proved to be a problem.He added: 'To see the world from the quadcopter???s point of view, you can put together a fancy video-transmission rig, or just do as I did???strap on a smartphone and fire up your favorite video chat app.'T
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