This is no surprise, but still of great concern.

Current research on next-generation drones seems certain to exacerbate the drone arms race. The U.S. and other countries are developing “nano” drones, tiny weapons designed to attack in swarms. Both the U.S. and China are working to incorporate “stealth” technology into micro drones. The Pentagon is fielding a new weapon called the Switchblade, a 5.5-pound precision-attack drone that can be carried and fired by one person — a capability sure to be envied by terrorists.

“This is a robotics revolution, but it’s not just an American revolution — everyone’s involved, from Hezbollah to paparazzi,” Singer, the Brookings Institution expert, told The Huffington Post. “This is a revolution in which billions and trillions of dollars will be made. To stop it you’d have to first stop science, and then business, and then war.”