I magine this: A small mapping drone is halfway through surveying a wildfire perimeter. Normally, it would have to break off, land, recharge, and then resume its mission — losing precious time. Instead, a larger “mothership” drone swoops in, hovers alongside, and transfers a fresh charge mid-air. The mapping drone never leaves its station. Mission saved. That’s the promise of drone-to-drone charging — aerial refueling for the age of autonomy. It’s a concept that could unlock

How ultra-light solar films could rewrite the limits of unmanned flight I magine a drone that doesn’t need to land. It circles tirelessly...