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Ilustration of a doctor raking in a Japanese rock garden drawn to resemble a person’s profile, symbolically erasing a tumor cell by reducing stress.
Health & Disease

How stress shapes cancer’s course

By Diana Kwon

Studies show psychological strain can accelerate tumors — could beta blockers slow them down?

Three panels show a cow, a chicken and a woman, with viral particles moving from each animal to the woman.
Health & Disease

Everything you need to know about bird flu

By Amber Dance

How dangerous is it? Where did it come from? H5N1 influenza’s origins stretch back to the 1990s, and key events paved the way for the outbreak we’re seeing today.

Illustration of a woman shows a primary tumor in breast that has spread to other body parts.
Health & Disease

How cancer cells travel to new tissues and take hold

By Amber Dance

Understanding these astonishing migrations through the human body, known as metastases, could suggest novel treatments

Animation visualizes one electron orbiting a proton along a specified orbit.
Physical World

Pursuing the electrical fluid: How scientists discovered the electron

By Tom Siegfried

A celebration of 2025 as the International Year of Quantum Mechanics and Science would be remiss without a look at how the carrier of electricity finally yielded its secrets — paving the way to the quantum era

Photograph of snow-capped mountains with forests and snowy landscape in foreground.
Physical World

How did eastern North America form?

By Alexandra Witze

With many collisions and much crumpling of rock, down the ages. The story holds lessons for how the edges of continents are built and change over time.

A 3D visualization shows an orbiter’s view of Mars with a prominent region of white ice visible atop the planet.
Physical World

Ghost rivers, hidden lakes: The long search for water on Mars

Martian lake beds and deltas reveal the Red Planet’s watery past. But many puzzles remain, scientist Bruce Jakosky says.

By Nicola Jones
Aerial photograph of solar panels and sundry huts set among vegetation.
Technology

For climate and livelihoods, Africa bets big on solar mini-grids

Nigeria is pioneering the development of small, off-grid solar panel installations to bring reliable electricity to remote communities — setting a model for other African countries

By Victoria Uwemedimo and Katarina Zimmer
An indigenous woman in traditional dress with a baby on her back stands in front of a lake, with high mountains in background.
Health & Disease

Born in thin air: Overcoming the challenges of pregnancy at high elevation

By Tim Vernimmen

In people not adapted to life at altitude, the sparse oxygen can impair fetal growth, causing problems that can last a lifetime. Researchers are searching for remedies.

Photo illustration shows aerial view of Reno’s skyscrapers, roads and some trees in the foreground. Overlaid with orange to suggest heat.
Food & Environment

Why sizzling cities are mapping hot spots street by street

By Ula Chrobak

In metros like Reno, Nevada, citizen scientists hit the road to collect detailed temperature data — key to taming urban heat, saving lives and designing for a warmer future

Collage featuring a brain, hippocampus, rabbit and neuronal activity.
The Mind

It began with a rabbit: Unraveling the mystery of memory

By Tim Vernimmen

Half a century after the discovery of long-term potentiation, we’re still learning how the brain remembers

Silhouette of a pig and a human overlap with a heart shared between them.
Health & Disease

Pig organs in people: The future of cross-species transplants

By Amber Dance

Can genetically modified animals help ease the shortage of organs? After years of research into xenotransplantation, the field is at a turning point — yet risks and ethical issues remain.

Two people conversing. Their speech bubbles contain short interjections.
The Mind

Huh? The valuable role of interjections

By Bob Holmes

Utterances like um, wow and mm-hmm aren’t garbage — they keep conversations flowing

Multimedia

Photo of a white-faced capuchin raising its arm and sticking out its tongue.
Living World

Meet the capuchin monkey: Curious, creative and vengeful

By Tim Vernimmen

UCLA’s Susan Perry has devoted decades to studying the fast-motion life of these New World primates and learning how the young acquire the skills they need to thrive

Insects crawl on, and mushrooms sprout from, a dead tree on the forest floor
Living World

The teeming life of dead trees

By Katarina Zimmer

Rotting logs turn out to be vital to forest biodiversity and recycling organic matter

Image shows the dark maria of the near side of the Moon alongside the lighter colored far side.
Physical World

Moon rocks reveal hidden lunar history

By Nicola Jones

As NASA astronauts aim for landings in 2027, geologists find surprises in recently retrieved samples from the far side

Photograph of a couple sitting on a couch. They are reading quietly.
The Mind

Quiet couples: Alone time together

By Francine Russo

The right kind of silence can be golden, revitalizing and strengthening a relationship

A condor spreads its wings on the summit of a mountain.
Food & Environment

Return of the California condor

By Iván Carrillo

North America’s largest bird disappeared from the wild in the late 1980s. Reintroduction work in the United States and Mexico has brought this huge vulture back to the skies. This is the story of its comeback.

Photograph of a woman lying on her bed in her home while a nurse in white coat and mask checks her vital signs.
Health & Disease

Bringing the hospital into the home

A movement to provide hospital-level care for sick patients in their own beds, in the comfort of familiar surroundings, is growing in the United States — a trend already embraced in some other countries

By Lola Butcher
Illustration shows a robot standing in front of a judicial robe hanging on a hook.
Society

Why regulating AI is so hard — and necessary

Misinformation, market volatility and more: Faced with the need to mitigate risks that artificial intelligence presents, countries and regions are charting different paths

By Carl-Johan Karlsson
A cross-section of a tree’s roots beneath the soil.
Food & Environment

Why scientists are enlisting fungi to save endangered plants

By Shi En Kim

The mycorrhizae that live among and in plant roots can boost the health of certain species, and even whole ecosystems — but scientists warn against a one-size-fits-all approach

A bristly, vivid green caterpillar sits on a piece of wood.
Living World

The caterpillars that can kill you

By Bob Holmes

Some species make venoms that are deadly. With more research, those toxic compounds could yield useful medicines.

Nine human silhouettes are depicted as tiled mosaics with patches of darker and lighter colors.
Health & Disease

We are all genetic mosaics

By Amber Dance

Picture your body: It’s a collection of cells carrying thousands of DNA errors accrued over a lifetime — many harmless, some bad, and at least a few that may be good for you.

Stars sparkle within pink, filamentous swirls on a black background.
Physical World

When everything in the universe changed

By Elizabeth Quill

The revolutionary James Webb Space Telescope and next-gen radio telescopes are probing what’s known as the epoch of reionization. It holds clues to the first stars and galaxies, and perhaps the nature of dark matter.

Little movie of a solar panel, over which clouds are slowly rolling on a gloomy day.
Food & Environment

Solving renewable energy’s sticky storage problem

By Katarina Zimmer

When the Sun doesn’t shine and the wind doesn’t blow, humanity still needs power. Researchers are designing new technologies, from reinvented batteries to compressed air and spinning wheels, to keep energy in reserve for the lean times.

Illustrated collage highlights some of the science stories of the year.
Society

Top science stories of 2024

This record-setting year for heat saw stunning auroras, a map of a brain, a Dengue epidemic, the first look at rocks from the far side of the Moon, an AI energy scramble and more

By Nicola Jones
A conceptual collage shows a web of images such as false morels, the brain, neurons and a person in a wheelchair, against an image of mountains.
Health & Disease

A devastating nerve disease stalks a mountain village

Neurologists have grappled with a cluster of amyotrophic lateral sclerosis cases in France, where a fondness for a toxic wild mushroom may hold the answer

By Terence Monmaney

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