Science

Its vast investment in solar, wind and batteries is on track to end an era of global growth in the use of coal, oil and gas, the researchers said.

By Max Bearak

Tech companies are displaying A.I., lasers and more as they compete for a piece of President Trump’s ambitious plan for a missile defense shield.

By Sheera Frenkel

Texas and New York are at the leading edge of an escalating states’ rights battle over the mailing of abortion pills to patients in states with bans.

By Pam Belluck

Some researchers suspect that rising prescription drug use may explain a disturbing trend.

By Paula Span

Weather patterns channeling moisture into the state have led to an abundance of lightning strikes that have ignited hundreds of wildfires.

By Amy Graff

Chris Wright, who travels to Europe next week to promote American gas, called climate change “not incredibly important.”

By Lisa Friedman

The upcoming U.S. Dietary Guidelines will instead be influenced by a competing study, favored by industry, which found that moderate alcohol consumption was healthy.

By Roni Caryn Rabin

Studies over the last decade of acetaminophen use in pregnancy — including a recent scientific review — have yielded mixed results but have not found a causal connection.

By Azeen Ghorayshi

People in the Eastern Hemisphere may see Earth’s shadow pass over the lunar surface, covering our world’s natural satellite in a flush of red.

By Katrina Miller

Researchers hope the technique could offer a more environmentally friendly approach to cleaning up messy clothing.

By Jacey Fortin

Two former agency leaders said the administration’s “hostility” toward vaccines had spread to the agency’s top ranks.

By Benjamin Mueller

A three-hour hearing before the Senate Finance Committee revealed that the health secretary was on uncertain ground even with some Republicans who voted to confirm him.

By Sheryl Gay Stolberg and Megan Mineiro

They work for depression and P.T.S.D. Could they also help the brain repair itself after a neurologic catastrophe?

By Rachel E. Gross

The health secretary fired the original committee members in June, replacing them with some who have been critical of vaccines.

By Apoorva Mandavilli, Dani Blum and Christina Jewett

The country lacks the ability to address multiple disasters happening at once, the Government Accountability Office said.

By Lisa Friedman

The agency’s staff scientists pointed out how Covid was still unpredictable and posed a threat to toddlers, but the official decided to restrict shots only to children with risk factors.

By Christina Jewett

California, Oregon and Washington said they would work together to review scientific data, saying the C.D.C. could no longer be trusted. But Florida said it would abolish all vaccine mandates.

By Emily Baumgaertner Nunn

A recent study hints at the potential benefits of restoring bison to an ecosystem.

By Alexa Robles-Gil

In the world of presidential health, distrust and speculation run so rampant that even Mr. Trump’s online assurance that he was fine was immediately explained away as part of a cover-up.

By Katie Rogers

In a post on Truth Social, the president suggested that the C.D.C. was being “ripped apart” over a question that was answered long ago.

By Apoorva Mandavilli and Carl Zimmer

Changes in screening recommendations over a decade ago may have inadvertently resulted in later diagnosis of the most common cancer in men, a new study has found.

By Roni Caryn Rabin

Deforestation is playing a greater role than researchers expected, according to a new study.

By Sachi Kitajima Mulkey

Scores of researchers reviewed the Energy Department’s argument about greenhouse gases and found serious deficiencies.

By Lisa Friedman and Sachi Kitajima Mulkey

Our reporter hits the treadmill to understand how scientists study extreme heat.

By Hiroko Tabuchi and Christopher Capozziello

Inspired by a funny request from his children years ago, his new series teaches young viewers about clouds, thunder and the ingredients of a rainbow.

By Laurel Graeber

An all-female research group, As Meteoriticas, scours the South American country’s interior aiming to preserve meteorites for scientific study and public display.

By Sam Cowie and Dado Galdieri

The oil giant accused the state’s attorney general and four nonprofit groups of defamation after they sued over recycling claims.

By Karen Zraick

A dazzling display in the nighttime sky might be seen much farther south than usual, including parts of Iowa, Oregon and Pennsylvania, by Tuesday, forecasters said.

By Nazaneen Ghaffar

Authoritarians have long feared and suppressed science as a rival for social influence. Experts see President Trump as borrowing some of their tactics.

By William J. Broad

In her latest book, Eugenia Cheng, a mathematician, explores the choices we make to determine if two things — numbers, shapes, words and even people — are equal.

By Katrina Miller

In her groundbreaking trilogy, “Women Scientists in America,” she told the stories of numerous accomplished but largely invisible women.

By Penelope Green

Robert F. Kennedy Jr.’s assault may have dealt lasting damage to the agency, experts fear, with harsh consequences for public health.

By Apoorva Mandavilli

The selection of Jim O’Neill, a former Silicon Valley executive, drew objections from Democrats, who noted his lack of medical or scientific training.

By Emily Anthes

The Trump administration’s campaign against wind power continued as it targeted funding for marine terminals and ports to support development of the industry.

By Brad Plumer

This was featured in live coverage.

By Michael Roston

This was featured in live coverage.

By Michael Roston

The director, Susan Monarez, declined to fire agency leaders or to accept all recommendations from a vaccine advisory panel made over by Mr. Kennedy, according to people with knowledge of the events.

By Sheryl Gay Stolberg, Apoorva Mandavilli and Christina Jewett

His meticulously crafted, lifelike designs were said to have “shaped the soul of modern fly fishing.”

By Jeré Longman

The blue dragons, which pack a ferocious sting, have led to several beach closures. Experts say it’s a worrying sign of the warming of the Mediterranean.

By Jonathan Wolfe

A Trump appointee has proposed rewriting a measure that requires companies to clean up “forever chemicals,” documents show. The new version would shift costs from polluters.

By Hiroko Tabuchi

A pilot program in six states will use a tactic employed by private insurers that has been heavily criticized for delaying and denying medical care.

By Reed Abelson and Teddy Rosenbluth

The full weight of a 50 percent tariff on Indian goods took effect this week, undercutting one of the country’s most promising markets for solar exports.

By Somini Sengupta

The season for strong storms came late. This week, it has led to travel delays, a snarled start to Burning Man and a recharged waterfall in Yosemite.

By Amy Graff

Susan Monarez was said to have refused to adopt Health Secretary Robert F. Kennedy Jr.’s stance on vaccination policy. A lawyer for Dr. Monarez said the firing was “legally deficient.”

By Sheryl Gay Stolberg, Apoorva Mandavilli and Christina Jewett

The president has made no secret of his distaste for wind and solar in America. Now he’s taking his fossil fuel agenda overseas.

By Lisa Friedman

The agency’s fall recommendations underscore the goals of Health Secretary Robert F. Kennedy Jr. to limit access to the vaccines, which he has long opposed.

By Christina Jewett and Jacey Fortin

Scientists have found that a single tree can be home to a trillion microbial cells — an invisible ecosystem that is only beginning to be understood.

By Alexa Robles-Gil

After two consecutive scrubs, SpaceX’s Starship vehicle launched on Tuesday night. The test aims to show that the mammoth rocket is capable of achieving key flight goals.

By Jamie Leventhal and Jiawei Wang

After setbacks during the last three launches of Starship, Elon Musk’s rocket splashed down in the Indian Ocean on Tuesday night.

By Kenneth Chang

He shared the Nobel Prize in Physics for his work on gravitational waves, which helped confirm Einstein’s general theory of relativity and how the universe began.

By Dylan Loeb McClain

The patient had traveled to Central America, where an outbreak of myiasis, an infection by screwworm larvae, has been ravaging livestock.

By Alexa Robles-Gil

Overproduction in China has led to slashed prices, and buyers on the continent are taking advantage to sharply increase investments in clean energy.

By Somini Sengupta

Weather interfered on Monday night with the ability of Elon Musk’s company to show it could overcome setbacks faced by its Starship prototype.

By Kenneth Chang

Two of the objects in the arrangement are cold brown dwarfs, which will serve as a benchmark for others throughout the Milky Way.

By Katrina Miller

Exposure to heat waves over just two years could add up to 12 extra days of age-related health damage.

By Sachi Kitajima Mulkey

San Francisco, Philadelphia and others are retreating from “harm reduction” strategies that have helped reduce deaths but which critics, including Trump, say have contributed to pervasive public drug use.

By Jan Hoffman

If you’re cooking with gas, it might help your health and the environment. Here’s why.

By Sofia Quaglia

Elon Musk’s company says it will try again on Monday for the next trip of its Starship prototype, which experienced setbacks during its last three flights.

By Kenneth Chang

More Americans are choosing burials in which everything is biodegradable.

By Paula Span

President Trump’s planned pharmaceutical tariffs threaten to hit many of the most common and well-known drugs that Americans take.

By Rebecca Robbins and Jonathan Corum

A reassessment of the iconic species has “some dramatic implications for how we view giraffe conservation across Africa,” a new study concludes.

By Carl Zimmer

Panel members have been given a broad mandate, despite pleas from C.D.C. employees asking Robert F. Kennedy Jr. to stop spreading misinformation.

By Christina Jewett

It is not just a scourge of the Middle Ages. Plague still exists, though it is rare. Here’s what to look for and how to protect yourself.

By Emily Baumgaertner Nunn

For some cultures, the practice of cranial deformation may have offered individuals a path to privilege later in their lives.

By Franz Lidz

The decommissioning would leave the United States with no icebreaker to study the southern seas and cede scientific leadership to rival countries like China.

By Raymond Zhong

The conflict that has put rebels in control of much of the east of the country has left victims with no legal recourse and dismantled many of the clinics that offered care.

By Stephanie Nolen

Meteorologists piece together the aftereffects in a hurricane’s path, and look ahead to potential future storms.

By Sachi Kitajima Mulkey

Lawmakers allocated $6 billion this fiscal year for PEPFAR, the H.I.V. prevention and treatment program, but the administration has indicated it will release less than half of that.

By Stephanie Nolen

The court’s order was fractured, with the justices splitting over whether individual cancellations and the policy behind them could be challenged in a federal trial court.

By Adam Liptak

Hidden River Cave was once filled with heavy metals and sewage that made the surrounding town smell awful. After a cleanup, it became a tourist draw.

By Hiroko Tabuchi and Jason Gulley

Fewer than 100 dusky gopher frogs were known to remain. Thanks to some very dedicated humans, numbers are now on the rise.

By Catrin Einhorn

One town’s effort to make pricey items accessible and encourage people to buy less stuff seems to be catching on.

By Cara Buckley and Ryan David Brown

A group of homeowners worked together to navigate the process of installing rooftop solar systems, saving time and money in the process.

By Claire Brown and Brian Kaiser

Global warming is changing the way storms behave.

By Sachi Kitajima Mulkey

Researchers discovered a new type of origami called bloom patterns, which are repeating tiles of creased patterns that rotate symmetrically around a center. Engineers are working on real-life applications, like a collapsable space telescope for NASA.

By Jamie Leventhal

To understand the virus’s re-emergence in America in 2025, some experts are looking to a past epidemic that had a high death rate in Philadelphia.

By Gina Kolata

His work on complex systems and responsive technologies helped lay the groundwork for later work on artificial intelligence.

By Clay Risen

The rare blast peeled back the inner layers of a dying star, offering clues to how the elements that make up life on Earth were forged.

By Jonathan O’Callaghan

The 29th moon found to be orbiting the solar system’s 7th planet is about six miles wide.

By Katrina Miller

Bloom patterns could be useful, as engineers build folding structures to send to outer space. They’re also very pretty.

By Kenneth Chang

A small, preliminary study found that marathoners were much more likely to have precancerous growths. Experts aren’t sure why.

By Roni Caryn Rabin

The administration has pledged to end support for Housing First, the approach behind the V.A.’s greatest housing success story.

By Ellen Barry

Chikungunya, which can disable victims for years, is spreading rapidly, including in China, France and other places that have not seen major outbreaks before.

By Stephanie Nolen

Streaked shearwaters keep a very regular rhythm throughout their daily foraging flights, shedding about 5 percent of their body mass every hour.

By Elizabeth Preston

It is lashing out at the world’s leading energy organization for saying oil and gas use could start declining as the world pivots to cleaner alternatives.

By Somini Sengupta and Brad Plumer

The Humanoid Robot Games in Beijing — featuring running, kickboxing and soccer — highlighted advancements in robotics. Limitations, too.

By Yan Zhuang

Simply giving money to poor families at certain times reduced deaths among young children by nearly half, a new study found.

By Apoorva Mandavilli

New research outlines how the savvy blue dasher lives happily in storm drains and park ponds others flee.

By Cara Giaimo

In 1978, Jerry Slocum assembled the first International Puzzle Party in his living room. Now it’s a global event.

By Siobhan Roberts

A draft of an upcoming White House report on children’s health was not as harsh toward the agriculture industry as some of Robert F. Kennedy Jr.’s allies had hoped.

By Dani Blum, Benjamin Mueller and Alice Callahan