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IVF ‘add-ons’ offer hope to parents desperate for a baby. But are they backed by science?

There's little evidence that many IVF "add-on" treatments work. Should they even be offered?

This Virus Stole a Human Gene and Won’t Let Go of It

CARL ZIMMER

Scientists have found a human gene lurking in a virus that causes skin infections. It may be using our own DNA to infect us.

NASA directive might increase the odds of contaminating Mars

The new push loosens U.S. regulations for sterilizing spacecraft bound for the Red Planet and calls for modernizing the science of "planetary protection"

The Atlantic hurricane season has been so quiet it’s unprecedented

El Niño has stymied storm formation even more than forecasters expected

Dangerous ozone threatened half of world’s population this year

This exposure reflects an intersection of climate change, air pollution and public health, says new analysis

AI solves a ‘holy grail’ problem from probability theory

Just days after a Fields Medalist predicted that an AI would solve the puzzle, Anthropic succeeded

Trump’s surgeon general nominee Nicole Saphier clears key Senate committee

Saphier's nomination now heads to the full Senate for a vote

Satellite images reveal ethereal auroral storm raging above the North Pole

The satellite, Smile, is a joint European and Chinese mission to study space weather and geomagnetic storms above Earth

Strange things happen in four dimensions

Disorder, exotic shapes and great uncertainty: while mathematicians understand phenomena in low and high dimensions very well, the 4D world raises many questions

Viper Image That Caused Alarm in California Was A.I.-Generated

VICTOR MATHER

A Gaboon viper, a venomous snake native to equatorial regions of Africa, was supposedly photographed in a tree in Santa Ana, Calif. How could that be? Well, it turns out it wasn’t.

See How El Niño Is Washing Ashore in California

RAYMOND ZHONG

An enormous pulse of wave energy will soon reach Southern California and continue north, raising sea levels by half a foot and increasing threats from swells and tides.

Clues to Why a Breakthrough Pancreatic Cancer Drug Eventually Stops Working

GINA KOLATA

Researchers are asking why patients, like former Senator Ben Sasse, inevitably develop resistance to the drug daraxonrasib.

Trump Sharply Scales Back Fuel Economy Rules for New Cars

BRAD PLUMER AND MAXINE JOSELOW

The move marked the final step in the administration’s efforts to dismantle policies aimed at speeding the shift to electric vehicles.

New Cancer Drugs Are Revolutionary. Why Don’t More Patients Get Them?

GINA KOLATA

Targeted gene therapies are highly effective at stopping cancers, but the very abundance of the treatments, plus cost and sluggish change, are hindering access.

Archeologists unearth a ‘major’ early Christian monastery in Scotland

The site, located on the island of Lismore, may have been established by Saint Mo Luóc in the sixth century C.E.