The Pain Wouldn’t Stop — Because Her Medication Had Been Stolen

Too often, seniors who use opioids become targets for exploitation and abuse.

New Study of Covid Booster Shots Fans Debate Over Benefits

Independent experts, including government scientists, were skeptical of the research from Israel, which included limited data over a short period.

A New Company With a Wild Mission: Bring Back the Woolly Mammoth

With $15 million in private funding, Colossal aims to bring thousands of woolly mammoths back to Siberia. Some scientists are deeply skeptical that will happen.

A Medical Career, at a Cost: Infertility

Physicians are raising awareness of the reproductive toll that work stress, long hours, sleep deprivation and years of training can exact.

Health Care in Afghanistan Is Crumbling, Aid Groups Warn

After the Taliban’s takeover, international donors withdrew funds that hospitals and clinics depended on. Now a fourth wave of Covid looms.

Health Care in Afghanistan Is Crumbling, Aid Groups Warn

After the Taliban’s takeover, international donors withdrew funds that hospitals and clinics depended on. Now a fourth wave of Covid looms.

How Math Solved the Case of the Volcanic Bombs That Didn’t Explode

Scientists have long been puzzled by flying blobs of magma that remained intact, but didn’t have a good way to study them.

Federal Research Bolsters the Case for Vaccine Mandates

Scientists believe the administration’s new measures may tamp down the pandemic, although the effects will not immediately be obvious.

Bruce Is a Parrot With a Broken Beak. So He Invented a Tool.

The bird is a kea from New Zealand, and his fabrication of an instrument to help him preen his feathers appears to be unique, researchers say.

A Swirling Vortex Is No Match for This Deep-Sea Sponge

A new paper finds a glass sponge has the power to eliminate destructive vortices that are created when fluid moves around a blunt object.

ADN y suerte: la fórmula para reunir a una elefanta huérfana y su mamá

Nania ha sobrevivido a la separación de su familia de elefantes del bosque en Burkina Faso. Sus cuidadores esperan que las pruebas de ADN ayuden a devolverla a la naturaleza con su familia.

When Was the First U.S. Covid Death? C.D.C. Investigates 4 Early Cases

The deaths, spread out across four states in January 2020, have become part of a scattershot collection of clues about the virus’s early spread.

Milkweed Butterflies Are More Murderous Than They Look

This behavior by the fluttering insects was so unusual that scientists had to invent a new word to describe it.

Komodo Dragons Are Now Endangered and ‘Moving Toward Extinction’

A top conservation organization updated the status of the fierce giant lizards on its Red List of threatened species.

‘Spaceship-Shaped’ Fossil Reveals Hungry Predator of Ancient Oceans

Titanokorys gainesi, turned up in the Canadian Rockies, was among the largest known predators 500 million years ago.

The Pandemic Has Set Back the Fight Against H.I.V., TB and Malaria

Prevention and treatment fell in poor countries last year as access to health care declined, according to a new report.

How the Cat Gets Its Stripes: It’s Genetics, Not a Folk Tale

Researchers took a deep dive into embryonic development to tease out the source of the tabby pattern in cats.

How the Cat Gets Its Stripes: It’s Genetics, Not a Folk Tale

Researchers took a deep dive into embryonic development to tease out the source of the tabby pattern in cats.

Black Vulture Attacks on Animals May Be Increasing

But some bird experts say reports of increasing predation by black vultures in the Midwest may be overblown.

Reuniting an Orphan Elephant and Her Mom, Perhaps, With DNA and Luck

Nania beat the odds to survive separation from her forest elephant family in Burkina Faso. Her caretakers hope DNA testing may help return her to the wild with her family.