Imagine: China deploys hundreds of thousands of autonomous drones in the air, on the sea, and under the water-all armed with explosive warheads or small missiles. These machines descend in a swarm toward military installations on Taiwan and nearby USbases, and over the course of a few hours, a single robotic blitzkrieg overwhelms the US...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. This giant microwave may change the future of war Imagine: China deploys hundreds of thousands of autonomous drones in the air, on the sea, and under the water-all armed with explosive warheads or...