R3 Bio has a bold idea for replacing lab animals: genetically-engineered whole organ systems that lack a brain. The long-term goal, says a cofounder, is to make human versions.

“This will be so, so, so, so, so bad,” one analyst says.

Next month, the Earth will come between the sun and the moon, causing the moon to take on an eerie reddish hue.

What scientists thought were four separate star clusters are actually part of one nearly invisible system.

A 2023 law championed by Republicans requires the CDC have a director confirmed by the Senate. For months, though, it’s had only acting directors—and the White House won’t say when that will change.

Massive data centers for generative AI are bad for the Earth. How about launching them into orbit?

A new report finds that of 154 specific claims about how AI will benefit the climate, just a quarter cited academic research. A third included no evidence at all.

As patients and employers look for alternatives to pricey GLP-1 drugs, Silicon Valley startup Twin Health is using AI and wearable sensors to help people make healthier choices.