Creativity
Below is a sketch of a flying machine made by Leonardo Da Vinci, probably in the early 1500s. I’m guessing the horizontal bars would have been filled in with fabric to create two wings, and the levers would have allowed the pilot to flap them like a bird. (Or perhaps stay in glide mode if the winds allowed.)
I love it that Da Vinci was imagining methods for human flight 400 years before the Wright Brothers. The human mind, if used creatively, is capable of incredible things.
