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A Key Paris Agreement Goal Is Dead. What Now?

DAVID GELLES

Leaders at COP31 are confronting a new reality as global warming enters the “unsafe zone.”

Why did a Brooklyn building collapse so suddenly? Experts weigh in

The devastating incident on Wednesday has left at least 8 people dead and more than a dozen injured

These Male Dolphins Do Something Rare: Day Care

FANNI DANIELLA SZAKÁL

Male Franciscana dolphins are exceptional babysitters. Scientists are trying to figure out if they are thoughtful fathers or just hope to be.

No other animal walks like humans do. Here’s why

Our uniquely human walking style comes with evolutionary benefits—but also a cost

Record-breaking simulation sheds light on cosmic ‘dark ages’

Lumina, a huge computer model laden with complex astrophysics, is giving scientists a breathtaking virtual view of the young universe

The neuroscience behind stuttering

The first consensus guidelines on stuttering, released this summer, are throwing new light on an ancient condition

SpaceX Aims for Starship Launch on Friday. Here’s What to Know.

KENNETH CHANG

The audacious maneuver planned for Friday is a key step toward the company’s goal of making rockets fully reusable.

Timing of Climate Science Reports Ignites a Hot Fight at U.N. Talks

CHICO HARLAN AND LISA FRIEDMAN

Several countries that rely heavily on fossil fuels want to delay the next round of scientific assessments that governments use to inform their climate policies.

Can SpaceX catch its Starship?

The 15th spaceflight of SpaceX's giant launch vehicle aims for something unprecedented: snatching both rocket stages from midair after a journey to orbit

The Euclid space telescope captures nearly a billion celestial objects in stunning detail

The enormous trove of galaxies and quasars will help astronomers piece together the most in-depth 3D map of the universe yet made

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.

FAA grounds all U.S. flights days after expanding its AI air traffic system

National ground stops of this kind are exceedingly rare

Democrats Put Targets on Notice as Trump Oversight Takes Shape

EVAN HALPER

Letters sent by two key House committees tell companies and officials not to destroy documents.

Math Puzzle: Slippery slopes

Slide down the slippery slopes of this math puzzle