Musk said the prominent A.I. start-up had put profits and commercial interests ahead of seeking to benefit humanity.

Once united over the future of artificial intelligence, they have become increasingly estranged over the years.

Internal disagreements over the direction of the Apple car led the effort to sputter for years before it was canceled this week.

The car, which Apple spent billions of dollars researching, had been intended as a rival to Tesla’s E.V.s, which include autonomous driving features.

Seeking social media stardom for their underage daughters, mothers post images of them on Instagram. The accounts draw men sexually attracted to children, and...

The message board site, founded in 2005, detailed its financial performance in a filing. It is the last of an early generation of social...

The A.I. chip maker’s revenue more than tripled, and profits rose ninefold. It also projected that its revenue would more than triple again.

The company raised $7.3 billion over the last year, as the lure of artificial intelligence changes Silicon Valley deal-making.

The A.I. start-up’s valuation tripled in less than 10 months.