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Meet a mouse whose brain cortex is made up of human cells

Multiple cameras tracked a mouse as it wandered around a small arena. A computer charted its position and speed, leaving Pong-like traces on a monitor.  The reason to watch this rodent so carefully? Nearly half its brain volume had been replaced with human cells. The effort to mix the brain...

The Download: engineered microbes for crops, and OpenAI’s culture problem

The Download: engineered microbes for crops, and OpenAI’s culture problem

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. How engineered microbes could help feed the world’s crops Fertilizer is crucial for the global food supply, but making it uses a lot of energy and...

AI models flub these intelligence tests. Can you fare any better?

AI models flub these intelligence tests. Can you fare any better?

Puzzles and games have been central to AI development since the very beginning. Just as we humans like to test our smarts with crosswords or logic puzzles, developers can test how far models have advanced with a gaming gauntlet. The term “machine learning” was popularized in a 1959 article by the...

The Download: threats from space mirrors and credit for AI drugs

The Download: threats from space mirrors and credit for AI drugs

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. This company’s plans to deploy space mirrors could jeopardize the night sky for many A company that plans to beam sunlight from space to Earth on...

Debates over AI consciousness are a trap

Debates over AI consciousness are a trap

“Runaway” AI, “rogue” agents, and “autonomous” actors—the current rhetoric would have you believe that AI agents are not only awake and aware, but angry at their creators. Prominent tech leaders such as Demis Hassabis, Dario Amodei, and Sam Altman push for regulation of these seemingly “superhuman”...

What happens when a kid’s robot best friend dies?

What happens when a kid’s robot best friend dies?

When Xander first met Moxie, she taught him that when he was anxious, he could calm down by exhaling through his lips so that he buzzed like a bee. They practiced breathing like dragons to manage feeling mad and sniffing like bunnies to boost his energy. But in the six years they’ve known each...

How ideas of a vast censorship network moved from the online fringe to Trump policy

How ideas of a vast censorship network moved from the online fringe to Trump policy

This article was produced in partnership with Type Investigations, with support from the Wayne Barrett Project. One morning in April 2025, employees of a small office in the US State Department got the email many of them had been dreading.  For months, Elon Musk’s Department of Government...