1. Human-Powered Helicopters: Straight Up Difficult


    from NPR Liked 313K 2,251 50

    Read the full story here: http://www.npr.org/2012/10/14/160670295/flight-club-human-powered-helicopter Explore the history of human flight here: http://www.npr.org/2012/10/12/159773795/timeline-the-history-of-human-powered-flight It's…

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