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El Niño will push temperatures above 1.5 degrees C. Will we ever come back down?

The astonishing strength of this El Niño could mean we surpass an important climate threshold—possibly for good

OpenAI’s ‘shepherds’ affirm blockbuster physics result

The company's appointed team of experts has verified and released the groundbreaking AI-generated proof, which validates bedrock assumptions of the Standard Model of particle physics

Newfound invisible object in space could be a rare supermassive neutron star

Astronomers saw something strange in a distant star system—or rather what's strange is what they didn't see. Solving the mystery could reveal new astrophysics

Metal-rich deep-sea ‘nodules’ also harbor diverse ocean life

The finding, researchers say, should factor into plans to mine the seafloor for the metal-rich nodules

Malawi Lacks Money to Fund its El Niño Plans

CHICO HARLAN, GOLDEN MATONGA AND JOAO SILVA

The question is being asked across the developing world, where hunger risk is high from the extreme weather El Niño is expected to bring. Malawi has a big plan, but little money.

The Russian Scientist Behind the Deadly Novichok Nerve Agents Has Died

CLAY RISEN

Vladimir Uglev, a lead developer of a Cold War-era chemical weapon used on the dissident Alexei Navalny, later turned against the government. He was 80.

‘Fight Harder,’ U.N. Chief António Guterres Implores, Rousing Climate Ambassadors at COP31

CHICO HARLAN AND LISA FRIEDMAN

The United Nations secretary general, António Guterres, spoke at COP31, a meeting aimed at reducing emissions, amid a sharp drop in attendance by world leaders.

25 Years After the Anthrax Attacks, America Remains Vulnerable

K. R. CALLAWAY

Letters filled with anthrax spores exposed flaws in the United States’ biosecurity systems. Experts say many of those issues still exist.

These Killer Female Apes Challenge the ‘Man the Hunter’ Origin Story

TAYLOR MITCHELL BROWN

Bonobos are as closely related to humans as chimps. New evidence that female bonobos are the primary hunters could radically alter our understanding of early human societies.

New Research Compares Long-Term Relief From 21 Antidepressants

CHRISTINA CARON

In the meta-analysis, a few drugs stood out for offering greater effectiveness over time.

This asteroid was born at the dawn of the solar system

Ryugu might have formed in the very first generation of planetary building blocks

Democrats Put Targets on Notice as Trump Oversight Takes Shape

EVAN HALPER

Letters that tell companies and officials not to destroy documents signal the direction of potential investigations next year.

Jensen Huang leaving Nvidia risks a ‘brain drain’ from the AI chipmaker

Nvidia's chips power the AI frontier—thanks, many say, to co-founder and now ex-CEO Jensen Huang

AI is disrupting math. Is science next?

Mathematicians will remember 2026 as the year AI changed everything about their field. Scientists may be next in line for disruption

Can a microdose of Ozempic help you live longer?

Tiny doses of GLP-1s are being marketed as antiaging drugs, but what evidence is there?