Alex Ossola

Major U.S.

indexes fell today, with the Dow leading the losses and closing down half a percent.

Brent oil futures rose 1.9 percent, driven by the U.S.

military buildup in the Middle East ahead of a possible strike on Iran.

Many investors see the robo-taxi market as a two-horse race between Tesla and Waymo.

And that's been weighing on Uber.

Its stock has lost nearly a quarter of its value over the past six months.

Heard on the Street columnist Dan Gallagher says investors are concerned that the ride-hailing and delivery giant is falling behind.

Dan says Uber isn't exactly sitting still on autonomous vehicles.

If there's one thing we know about artificial intelligence, it's that it takes a lot of energy.

The need is so great that even jet engines are being brought on as a power source.

Heard on the Street columnist Jinju Lee recently spoke to host Patrick Coffey of our Tech News Briefing podcast about how it works.

That was Heard on the Street columnist Jinju Lee speaking with our colleague Patrick Coffey.

Hear more of their interview on tomorrow's episode of Tech News Briefing.

And finally, we have an update on the arrest of former Prince Andrew earlier today.

Police didn't disclose the exact allegations they were investigating, but the arrest comes after disclosures about his dealings with Jeffrey Epstein that have dominated headlines in the U.K.

Police questioned Andrew Mountbatten-Windsor today, but he hasn't been charged.

Police say he's been released under investigation.

Earlier in the day, King Charles said he had learned of his younger brother's arrest with, quote, deepest concern and that the royal family supported a full investigation.

Mountbatten-Windsor has consistently denied any wrongdoing in relation to his dealings with Epstein.