BBC's Dave Lee watches the brain-controlled drone get given its first public outingA drone specialist in Portugal demonstrates a flight controlled by human brainwaves, and suggests a future of large-scale unmanned flying. Subscribe to BBC News HERE bit.ly/1rbfUog Check out our website: www.bbc.com/news Facebook: www.facebook.com/bbcworldnews Twitter: www.twitter.com/bbcworld Instagram: instagram.com/bbcnews

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