‘Robot dragonfly’ is the smallest and lightest self-navigating drone

A group of Dutch engineers from the Delft University of Technology have created the world’s first Micro Air Vehicle that can fly in any surroundings and automatically avoid obstacles. 
Micro Air Vehicles are a specific class of aerial drones nearer in size to insects than airplanes, and the DelFly Explorer is no exception – weighing just 20 grams, or as much as four sheets of A4 paper.