Stationary ballistic missiles are easy for enemy forces to destroy preemptively. China’s mobile, truck-launched DF-21D ballistic missiles are not. After blasting off near the coast, the missiles travel to the edge of space before reentering the atmosphere at more than 3,000 mph and dropping 1,300 pounds of explosives on targets. China didn’t nickname the DF-21D the “carrier killer.” U.S. defense analysts did.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.