"To many people, the thought of pilotless vehicles whizzing overhead delivering everything from clothes to groceries to skateboards seems like something out of a science fiction novel. But some of the world's biggest e-commerce companies are in a fierce race for early control of the drone delivery market, especially in the United States. They are spending hundreds of millions of dollars to design and develop drone delivery systems that are cost-effective,...

"Since their introduction in the 2000s, the popularity of recreational drones, also called unmanned aerial vehicles (UAVs), is growing. According to the United States FAA Unmanned Aircraft Systems Report for 2019, the number of unmanned drones, both commercial and recreational, is expected to double over the next year from 1.2 million to nearly 2.4 million.Improved technology and lower prices are two factors driving the growing popularity of recreational...