Researchers made a drone that can land on walls like an insect

Researchers at Stanford are trying to give drones another of insects' useful traits: the ability to land on vertical walls, and even upside down. They've already gotten pretty far on a system that lets drones do that. As one of the researchers writes at IEEE Spectrum, the setup has two parts: a rigid tail, and a pair of "microspines." The tail allows the drone to correctly position itself while landing; the two microspines, which are really just small textured pads, are then dragged along the wa...