Many scientists say “subcritical” experiments and computer simulations make nuclear weapons testing unnecessary.

In a small study, mice given fecal transplants from elite cyclists and soccer players had higher levels of glycogen, a key energy source.

As 23andMe prepares to be sold, Science News spoke with two experts about what’s at stake and whether consumers should delete their genetic data.

GS-z13-1, marks the earliest sign yet spotted of the era of cosmic reionization at 330 million years after the Big Bang.

A genetically modified mini pig’s liver was able to function in the body of a brain-dead patient throughout a 10-day experiment.

A dog's physical cues often take a backseat to environmental ones, skewing humans' perceptions, a small study suggests.

Carbon credits sold on the voluntary market are under scrutiny for not offsetting greenhouse gas emissions as claimed.

A vaccine kept patients free of pancreatic cancer for years, yet new reports say the NIH is advising against mentioning mRNA tech in grants.

John Green’s new book, Everything Is Tuberculosis, reveals how social injustice sustains the disease, despite available cures and vaccines.

Mouse cells tweaked to produce the tardigrade protein incurred less DNA damage than unaltered cells — hinting at a new tool for cancer patient care.

Solve the math puzzle from our April 2025 issue. In honor of April Fools’ Day, we offer the puzzling case of the Lesser Fool.

The clicking of flattened teeth, discovered by accident, could be “the first documented case of deliberate sound production in sharks,” evolutionary biologist Carolin Nieder, of Woods Hole ...