In an era of overt sexism in the sciences, she made two major discoveries, including identifying a neuropeptide later linked to chronic pain syndromes and migraines.

Federal health officials have pared back the number of shots recommended for children. The states, led by Democrats, say the changes were not based on science.

Ms. Stavenhagen started a group intended to counter the notion that A.L.S. was an “older white man’s disease.”

Dr. Ralph Abraham, the agency’s principal deputy director, has called the Covid vaccines “dangerous.” Other skeptics have recently left federal health roles.

Horses, with their high-pitched whinnies, seemed to buck the trend of larger animals producing lower sounds, but a new study explains the mechanics behind the noises a horse makes.

The next moon mission, carrying four astronauts, could launch as soon as early March.

A closely watched clinical trial in Britain that screened blood for early detection of cancer did not show a reduction in later stages of the disease.

President Trump’s executive order aimed at spurring production of a pesticide has infuriated leaders of Health Secretary Robert F. Kennedy Jr.’s MAHA movement.

Technical and oversight problems left two astronauts aboard the International Space Station for months longer than had been expected.

Dr. Jay Bhattacharya will serve as acting director of the Centers for Disease Control and Prevention until President Trump appoints a permanent director.

In the oceans and on land, scientists are discovering rare, transitional organisms that bridge the gap between Earth’s simplest cells and today’s complex ones.

Moderna said it had held further discussions with regulators and announced that the agency would accept the company’s application for approval of its flu vaccine that uses mRNA technology.

In the Lost Science series, scientists whose jobs or funding have been cut by the Trump administration tell their stories.