http://www.theverge.com/2015/2/9/8006509/bouncy-ball-drone-flyability-gimball (http://www.theverge.com/2015/2/9/8006509/bouncy-ball-drone-flyability-gimball)
(https://cdn0.vox-cdn.com/thumbor/SzGiInnyr238C73xa0FYYXkI8CU=/600x0/filters:no_upscale()/cdn0.vox-cdn.com/uploads/chorus_asset/file/3392236/safety-drone-1__1_.0.gif)
(https://cdn1.vox-cdn.com/thumbor/sOqVSuGjh1BskDGHgfjHnZm8uMk=/600x0/filters:no_upscale()/cdn0.vox-cdn.com/uploads/chorus_asset/file/3392238/safety-drone-2.0.gif)
http://www.youtube.com/watch?v=6yunaYjPsZs (http://www.youtube.com/watch?v=6yunaYjPsZs#t=53)