<iframe width="580" height="385" src="https://www.youtube.com/embed/O-1r8NC3Axk" frameborder="0" allowfullscreen></iframe> <br>Think you can build a non-mechanical flying object that stays in the air for a long time? Then this Paper Flying Wing Contest with ... <br><a href="https://www.youtube.com/watch?v=O-1r8NC3Axk">source</a>
