Scientists were slow to recognize that Covid spreads through the air. Some are now trying to get ahead of the bird flu.

Faced with a rash of shark deaths marked by brain swelling, Canadian and American scientists are trying to solve a marine mystery.

Our early human ancestor was capable of running, if slowly, a new study finds.

A seismologist thinks natural phenomena could explain the Summerville Light and other mysteries around a South Carolina locale.

Vague federal directives have led to frantic action, and perhaps overreaction, before a Friday deadline.

Faced with a rash of shark deaths marked by brain swelling, Canadian and American scientists are trying to solve a marine mystery.

When a scientist received a video of a spotted hyena in the southern part of his country, he thought someone was playing a trick on him.

Michael Kratsios, who served in the White House and Defense Department in the first Trump administration, is a policy specialist on artificial intelligence.

Some oncologists suggest that, for certain early cancers not at risk of spreading, the term “cancer” should be avoided.

PEPFAR’s computer systems also are being taken offline, a sign that the program may not return, as Republican critics had hoped.

Tiny mites seem capable of relying on the power of static cling to hop into hummingbird nostrils and move between flowers.

A pandemic is not inevitable, scientists say. But the outbreak has passed worrisome milestones in recent weeks, including cattle that may have been reinfected.

A museum curator with a ladder showed that birds that build cavity-style nests are able to protect their eggs with the skin shed by snakes.

Italian scientists have drawn from thermodynamic principles to prevent a famous pasta from turning into a gooey mess.

R.F.K. Jr. and others have blamed the ingredient for allergies and other illnesses. Scientists say it actually bolsters the immune response.

With time-lapse video, scientists show how tiny mushroom corals can move themselves to influence their fate.

The cases have spurred new pet food safety rules and poultry surveillance efforts.

A group of 15 states have reached a tentative new deal that would require them to set aside hundreds of millions of dollars from the settlement in a legal-defense fund for the family.

A large study found that men lost seven years of life expectancy and women lost nine years, compared with counterparts without the disorder.