It messes up hair, it blows stuff in eyes, and most famously and rudely of all, one time it made a bridge in Washington twist and undulate until it exploded. Alright, maybe that was the fault of the engineers, not the wind. But still, strong gusts have the potential to threaten many technologies, including a new one: drones. If you've ever taken a quadcopter out on a windy day, you know the struggle. Now consider that in the near future, our cities will be swarming with delivery drones--and if we don't want them plummeting out of the skies, they'll have to learn to survive the elements.