A new wave of “reasoning” systems from companies like OpenAI is producing incorrect information more often. Even the companies don’t know why.

Residents of an upscale enclave outside Austin, Texas, learned the hard way what it’s like when a multibillionaire moves into the mansion next door. Some of them have started a ruckus over it.

A push to rename streets and remove statues associated with imperial Russia is dividing Odesa, whose identity is tied up in its history.