At a vast greenhouse in the central Danish city of Odense, a squad of robots move thin plastic pots of herbs for shipping without even putting a dent in them. For moviegoers used to seeing humanoid machines in action, that might not seem special ...

In the quest to build drones that can enable companies such as Amazon to make door-to-door deliveries, engineers are racing to overcome a fundamental challenge: helping unmanned, suitcase-sized aircraft see where they're going. The answer is developing sensors that are smart enough to keep the ...