The Escalating Warnings About A.I., and the Rise of a Deadly New Street Drug

Plus, the man who went to space — and never wanted to go back. 

Here’s what we’re covering:

• Some in Silicon Valley Are Questioning the Calls for an A.I. Slowdown, by Kalley Huang and Mike Isaac
• E.P.A. Expected to Erase Limits on Climate Pollution From Power Plants, by Maxine Joselow
• A Teen Autopsy Marks the Arrival of a Deadly Drug in San Francisco, by Heather Knight
• Toyohiro Akiyama, Japan’s Chain-Smoking ‘Space Antihero,’ Dies at 84, by Javier C. Hernández and Hisako Ueno

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