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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