The drone takes off, hovering a few feet off the ground. I guide it up to about 12 feet with the throttle on the remote control. Then my three year old son takes over. He taps the screen on an iPad running our piloting app. The drone, a DJI Phantom 4, begins to ascend, heading towards an abandoned grainery. My son happily taps away at the screen, shifting the drone here and there. You wouldn’t notice how frantically ...