Machine-learning systems are black boxes even to the researchers that build them. That makes it hard for others to assess the results.

Billy Mitchell issues a 156-page “evidence package” in an attempt to prove his feats of arcade greatness.

With these apps, your Apple Pencil might actually replace your *real* pencils.

Automakers show off their latest in Frankfurt, and California lawmakers rewrite the rules of the road for Uber and Lyft.

Also: President Trump loses another national security adviser, a potential ban on e-cigarettes, and more.

The latest iteration of Fitbit's popular smartwatch is still useful, if flawed.

A new measurement seems to eliminate an anomaly that has captivated physicists for nearly a decade.

The heavy hallucinogen ibogaine is illegal in the US, but some addicts are flocking to Mexican clinics for it, hoping to be cured. A physician investigates.

MIT’s Media Lab, Harvard, Stanford, hospitals—they all take money from donors. Whether it's to truly help the world, or merely burnish a reputation, the money nevertheless bends the arc of the innovation universe.

The spacecraft Juno made it through a very hostile environment to send back images of this enormous, telegenic, enshrouded planet.

White house spying, North Korea sanctions, and more of the week's top security news.

Watching 'Buck Rogers in the 25th Century' can be quite a shock in the 21st.

We've been testing inkless "Zero Ink" printers and instant cameras for months. These are our favorites.

Have an iPhone 11 hangover? These tech discounts may perk you up.

How do you make blockchain and other transactions truly private? With mathematical models known as zero-knowledge proofs.

An innovative browser has launched on Android for the first time. Here's why you might want to give it a shot.

Games built with the open source tool Bitsy are often more like stories. Our writer created one in two hours.

Also: PewDiePie canceled his donation to the Anti-Defamation League, and 'Control' might get a major crossover.

The Justice Department is investigating automakers who struck a deal with California. Some in Congress want to investigate the investigators.

With the departure of John Bolton from the White House this week, even the former national security advisor’s biggest critics are worried.