The blockbuster stock market debut of Elon Musk’s rocket company paves the way for a wave of enormous offerings that are coming from OpenAI and Anthropic.

Anthropic raised $65 billion in new fund-raising that put its value at $900 billion, ahead of OpenAI’s last valuation of $730 billion, as the companies duel for A.I. dominance.

The billionaire’s new roots in Argentina are said to be partly motivated by concerns about the future of the United States and shared beliefs with Argentina’s right-wing leader.

A Mad Hatter and a giant rabbit sit around a table discussing an A.I. start-up. This is normal behavior around the Bay Area these days.

The dream of clean hydrogen has tantalized energy experts for years, but producing it has been tough. Many start-ups think the answer could lie beneath our feet.