National & World News

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.

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ARI SHAPIRO, HOST:

The killing of four people at a Waffle House in Nashville, Tenn., early Sunday morning is exposing the frequent breakdown among law enforcement agencies that regulate gun ownership.

A man who had his firearms license revoked in Illinois, after being arrested by the U.S. Secret Service at the White House last July, may have broken no laws by having guns — including an AR-15 — when he moved to Tennessee late last year.

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.

Former President George H.W. Bush, whose wife, Barbara, died just last week, has been admitted to a Houston hospital for an infection that has spread to his blood.

"He is responding to treatments and appears to be recovering," Bush family spokesman Jim McGrath said in a statement. "We will issue additional updates as events warrant."

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