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Four nuclear reactors hit a big milestone in the US

But achieving criticality doesn’t mean a reactor is ready to provide electricity for the grid (or at all, for that matter). Let’s untangle what this program’s success could mean for nuclear power... Read more »

Four nuclear reactors hit a big milestone in the US

But achieving criticality doesn’t mean a reactor is ready to provide electricity for the grid (or at all, for that matter). Let’s untangle what this program’s success could mean for nuclear power... Read more »

Sperm donors need limits, says a European fertility group

Many countries already have legal limits for donors. In Malta and Cyprus, for example, both egg and sperm donors are allowed to contribute to the birth of just a single child, according... Read more »

Sperm donors need limits, says a European fertility group

Many countries already have legal limits for donors. In Malta and Cyprus, for example, both egg and sperm donors are allowed to contribute to the birth of just a single child, according... Read more »

The Download: Claude’s inner workings and OpenAI’s “super app”

Researchers at the company built a tool called the Jacobian lens (or J-lens) and used it to uncover a hidden area, which they named the J-space, inside its flagship LLM, Claude. The... Read more »

The Download: Claude’s inner workings and OpenAI’s “super app”

Researchers at the company built a tool called the Jacobian lens (or J-lens) and used it to uncover a hidden area, which they named the J-space, inside its flagship LLM, Claude. The... Read more »

The Download: “reprogramming” aging, and the hidden sense of interoception

The idea is to treat the disease by regenerating healthy nerves in the eye—but the company already hopes to go further. If the treatment can reverse glaucoma, similar treatments could reverse other... Read more »

You do your own time

I tilted my face up and gave the eye in the sky the finger. It didn’t matter. They already knew where I was. “Let’s go in.” “Wait,” said Gibson, both hands cradling... Read more »

Inside Interoception: The hidden sense of how you feel inside

Think of the captain’s bridge on the USS Enterprise, where a live map displays the status of the ship’s critical systems: oxygen levels, energy availability, hull integrity, shield strength. Another set of... Read more »

Why “reprogramming” is the buzziest approach to reversing aging right now

Again, that doesn’t mean senolytic drugs that target “zombie cells” won’t work. But it feels as if many in the field have moved on. These days, the buzz is all about ✨reprogramming✨.... Read more »