The S&P 500 is set for a small loss in October, despite a deeper slide in some of the A.I. stocks that exert a heavy influence on the index.

© The New York Times

Forget California’s billionaire wealth tax. The economist Natasha Sarin believes there are better ways to make billionaires pay up.

© The New York Times

Amazon became the latest tech company to announce swelling investments in A.I. amid stumbling share prices.

© Nathan Howard for The New York Times

A.I. has uncovered a horde of software flaws, which engineers are racing to fix before they can be exploited and abused by hackers.

© Ariel Davis

A prominent researcher claims to have a revolutionary approach to “interpretability,” or the science of why A.I. models do what they do. Other experts aren’t so sure.