All Things Considered

From San Francisco to Washington, D.C., e-scooters and dockless bikes have become the latest transportation trend to grip urban spaces — and local governments are struggling to keep up.

The concept is simple: Riders download an app, find and unlock a scooter or bike, and leave it when they're done. Many cost as little as $1, and fans of the services tout them as faster, easier, and greener ways to get where they're going.

Killer robots have been a staple of TV and movies for decades, from Westworld to The Terminator series. But in the real world, killer robots are officially known as "autonomous weapons."

At the Pentagon, Paul Scharre helped create the U.S. policy for such weapons. In his new book, Army of None: Autonomous Weapons and the Future of War, Scharre discusses the state of these weapons today.