The Download: what tomorrow holds for today's babies, and replacing the brain

Drones have been a mainstay technology among militaries, hobbyists, and first responders alike for more than a decade. No longer limited to small quadcopters with insufficient battery life, drones are aiding search and rescue efforts, reshaping wars in Ukraine and Gaza, and delivering time-sensitive packages of medical supplies. And billions of dollars are being plowed into building the next generation of fully autonomous systems. These developments raise a number of questions: Are drones safe enough to be flown in dense neighborhoods and cities? Is it a violation of people's privacy for police to fly drones overhead at an event or protest?