Two papers challenged the existence of theorized particles called sterile neutrinos that might account for mysteries like the cosmos?s dark matter.

The president withdrew Jared Isaacman?s nomination to lead the space agency in June, but senators of both parties appeared willing to give him a second shot at confirmation.

GLP-1 drugs for pets could be the next frontier for the blockbuster weight loss and diabetes drugs.

A global treaty has extended trade protections to more than 70 shark and ray species whose numbers are in sharp decline.

The slaty-masked tinamou, recently discovered in Brazil, is utterly unafraid of people. That could be its undoing, ornithologists worry.

The ability of Russia to launch astronauts to the International Space Station remains in limbo after an incident last week at the Baikonur base in Kazakhstan.

After the virus returned to Hawaii this fall, testing the shots in the endangered seal species became urgent.

With the help of A.I., a historian has identified the killer in a 1941 image that defined the savagery of the Nazi regime.

A researcher found that a Japanese pond frog is impervious to the stings of the northern giant hornet, even when it goes down the hatch.

The president said he would weaken Biden-era mileage standards, which were designed to increase electric-vehicle sales, calling them a ?scam.?

?Masking? is part of life, especially for those with autism or A.D.H.D. But hiding your true self comes with a cost.

Here?s what to know about your daily brew and the environment.

Executives from top automakers were invited to attend the announcement at the White House on Wednesday.

Paid home care is buckling under the surging demands of an aging population. But there are alternatives that could upgrade jobs and improve patient care.

While the president said he had an M.R.I. exam, a physician?s memo released by the White House was less specific.

Employees suspended in the summer after signing a letter critical of the president were told they could return to work. But the reinstatement was short-lived.

Shifting politics, intensive lobbying and surging disinformation online have undermined international efforts to respond to the threat.

Less than 10 percent of heart and lung surgeons in the United States are women. At a recent conference, they vowed to change that.

The agency?s top vaccine regulator proposed broad changes, claiming that a new review linked 10 children?s deaths to the Covid vaccine. But public health experts questioned the findings, wanting to examine the data.

On its own, LATE dementia is less severe than Alzheimer?s, but in combination, it makes Alzheimer?s symptoms worse, scientists say.

Industry groups and scientists have urged the Trump administration to reconsider its plan to close a renowned Agriculture Department center in Maryland and disperse its work around the country.

In a small study, pet cats greeted male owners with more vocalizations than they did female caregivers.

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