Drones

Owls are the assassins of the bird world: big, fast, and almost completely silent. A barn owl can drop onto a mouse from a few meters away and the mouse never hears it coming. That silence isn’t magic — it comes from three specific features on the wing, and over the last few years engineers have been measuring exactly how each one works so they can copy it onto spinning blades. The payoff is quieter drones, fans, and wind turbines, sometimes with more thrust rather than less.