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Greta Thunberg Says She’ll Skip U.N. Climate Summit in Glasgow

The teenage activist, citing concerns about global vaccine inequality, said she would not attend the meeting “unless everyone can take part on the same terms.” …

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To Speed Vaccination, Some Call for Delaying Second Shots

Stretching the time between the first and second doses would greatly accelerate the rate at which people get at least partial protection. But some experts fear it could also lead to new variants. …

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These Rocks Made a 1,000-Mile Trek. Did Dinosaurs Carry Them?

Researchers suggest a collection of prehistoric stones found in Wyoming journeyed from Wisconsin in the bellies of very large beasts. …

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Has the Era of Overzealous Cleaning Finally Come to an End?

This week, the C.D.C. acknowledged what scientists have been saying for months: The risk of catching the coronavirus from surfaces is low. …

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Vaccinated Mothers Are Trying to Give Children Antibodies via Breast Milk

Researchers agree that antibodies generated after a Covid-19 vaccine can be safely passed through breast milk. But they may not offer the level of protection parents are hoping for. …

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As Locusts Swarmed East Africa, This Tech Helped Squash Them

A hastily formed crowdsourcing operation to contain the insects in Kenya, Ethiopia and Somalia could help manage climate-related disasters everywhere. …

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Una partícula diminuta podría alterar las leyes de la física

No es el próximo bosón de Higgs, todavía. Pero la mejor explicación, según los físicos, tiene que ver con formas de materia y energía no conocidas actualmente por la ciencia. …

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More Contagious Covid Variant Is Now Dominant in U.S., C.D.C. Says

The B.1.1.7 variant, first identified in Britain, is now the source of most new coronavirus infections in the United States, the director of the Centers for Disease Control and Prevention said. …

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Finding From Particle Research Could Break Known Laws of Physics

It’s not the next Higgs boson — yet. But the best explanation, physicists say, involves forms of matter and energy not currently known to science. …

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How Debt and Climate Change Pose a ‘Systemic Risk to the Global Economy’

With dozens of countries struggling to manage both staggering debt and mounting climate disasters, some financial leaders are debating green debt relief. …

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Lecciones históricas sobre la resiliencia

Los brotes generalizados de enfermedades tienen el potencial de sacudir a las sociedades para que adopten nuevas formas de vida. …

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Born to Be Lazy? What Bears Can Teach Us About Our Exercise Habits

Scientists have found that grizzlies, like people, seem to choose the path of least resistance. …

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A Novel Effort to See How Poverty Affects Young Brains

An emerging branch of neuroscience asks a question long on the minds of researchers. Recent stimulus payments make the study more relevant. …

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Florida Crisis Highlights a Nationwide Risk From Toxic Ponds

Thousands of open-air waste pools near power plants, mines and industrial farms can pose safety dangers from poor management and, increasingly, the effects of climate change. …

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Isamu Akasaki, 92, Dies; Nobel Winner Lit Up the World With LEDs

A physicist, he shared the prize with two others for their breakthrough in creating blue light-emitting diodes, succeeding “where everyone else had failed.” …

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Florida’s Crisis Highlights a Nationwide Risk From Toxic Ponds

Thousands of open-air waste pools near power plants, mines and industrial farms can pose safety dangers from poor management and, increasingly, the effects of climate change. …

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Breast Cancer Centers Urge Annual Scans, Counter to U.S. Guidelines

A panel recommends biennial screenings, starting at 50, but a new study took issue with the way hundreds of centers are telling women 40 and up to come in yearly. Some experts contend that frequent mammograms can “do more harm than good.” …

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Why I Gave My Mosaic Embryo a Chance

‘It was like rolling the dice, except for someone you’ve never met.’ …

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‘There Was Nothing Anybody Could Do for These Patients.’ Now There Is.

The first successful direct transplant of a trachea is a medical milestone that could help thousands of people with airways damaged by ventilators and other causes. …

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Salmonella Outbreak Is Linked to Wild Birds, C.D.C. Says

The Centers for Disease Control and Prevention said 19 people had been sickened in eight states. …

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Use Your Newspaper to Make Flowers

Colorful paper blooms are easy to make and perfect for a spring table top. …

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April the Giraffe, Who Became an Internet Sensation in 2017, Dies

April, 20, gained fame giving birth as millions watched via livestream. She was euthanized on Friday because of her worsening arthritis. …

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The Latest Issue in Divorces: Who Gets the Embryos?

Amid the pandemic, I.V.F. rates are on the rise, and so are disputes about what to do with remaining frozen embryos when couples split up. For some, it has gotten messy. …

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Would You Jump In to Stop an Assault?

A recent video showed several men seeming to ignore an anti-Asian attack in Midtown. Yet research shows that most people are more than willing to intervene and help someone. …

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Test Flight for Sunlight-Blocking Research Is Canceled

The Swedish Space Corporation said it had canceled the flight — part of research to better understand the controversial idea of blocking the sun to fight climate change — after an outcry from environmentalists and others. …

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