A Guardian investigation into the U.S. overdose slowdown found that national declines masked sharp local disparities. Here's how the reporting team got the story.

When your AI assistant calculates revenue, bonuses, VAT or financial summaries, it isn’t doing math. It’s telling a convincing story about numbers.

Yitzi Snow makes his New York Times Crossword debut. The New York Times has launched the Midi, a daily medium-size crossword.

Key advances in the development of artificial neural networks came from psychologists seeking to understand how the human mind works.