California Democrats are fighting over a proposed wealth tax. Can our panel of experts sort out the merits?

Defections, secret conversations, deal talks that fizzled and a battle for control: The turmoil at Thinking Machines Lab is the artificial intelligence industry’s latest drama.Ms. Murati with Mr. Altman and two other OpenAI colleagues in 2023. She co-founded Thinking Labs a year ago.

Greensboro’s economy depended on friendly relations with Canada. But after tariffs and threats to make the country the “51st state,” neighborly ties have frayed.Willey’s Store has long attracted customers from Canada.

An extreme athlete built a wellness lair in New Jersey and turned it into the members-only club of his dreams.Devon Levesque at Sweet Honey Farm in Marlboro, N.J.

Sergey Brin is joining his Google co-founder, Larry Page, in reducing ties to the state where they built their fortunes.Larry Page, left, and Sergey Brin, two Stanford graduate students, founded Google in 1998 and made it a cornerstone of Silicon Valley’s internet industry.