Modern medicine is built on the promise that antibiotics will clear away the bacteria that made everything from skin infections to surgery potentially lethal just a few generations ago. But drug-resistant strains of disease have spread in recent years.
Dozens of young Americans have attempted to join overseas jihadist groups in the past several years, raising special concern among counterterrorism officials that they might bring the fight home with them when they return.
Autonomous vehicle technology is already here: Cars park themselves, alert drivers to impending dangers, and even apply the brakes in emergencies. But what will it take to unlock its potential for major societal benefits?